Bruno Bassi Millan Torres

@ifsc.usp.br

Universidade de São Paulo - Instituto de Física de São Carlos
Universidade de São Paulo - Instituto de Física de São Carlos

Bruno Bassi Millan Torres


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RESEARCH, TEACHING, or OTHER INTERESTS

Organic Chemistry, Spectroscopy, Condensed Matter Physics, Surfaces and Interfaces
30

Scopus Publications

Scopus Publications

  • Stability testing: A versatile, low-cost, ISOS-compliant apparatus for third-generation solar cells
    Yosthyn M. Ariza Florez, Bruno Bassi Millan Torres, Roberto Mendonça Faria, Gregório Couto Faria
    Measurement Netherlands, 2026
    Third-generation solar cells are projected to achieve high energy conversion efficiency and, at the same time, have low production costs. Despite achieving high efficiencies, research on degradation processes under continuous use and ambient conditions remains limited, mostly due to the absence of affordable- commercially available degradation setup. To overcome it, we detailed the fabrication, assembly and test of an affordable and easy-to-setup experimental apparatus for stability and degradation study of solar cells technologies. The apparatus was designed following the ISOS protocol consensus and was validated using Organic Solar Cells (OSCs) devices with standard P3HT:PC 61 BM active layers, enabling the acquisition of degradation trends consistent with literature benchmarks. Three ISOS protocols for indoor testing were employed (ISOS-L-1, ISOS-D-1, and ISOS-T-2), along with one outdoor protocol, ISOS-O-2. Our proposal presents a simple and accessible experimental setup to expand the adoption of degradation testing, laying the basis for universal and more systematic methods of assessing device lifetime. Its cost-effective design also ensures direct integration into existing protocols, further expanding access to long-term evaluation processes.
  • From Tape to Transistor: A Low-Cost and Cleanroom-Free Route to Flexible Vertical Organic Electrochemical Transistors
    Marcos Luginieski, Gustavo Gonçalves Dalkiranis, Bianca de Andrade Feitosa, Bruno Bassi Millan Torres, Gregório Couto Faria
    ACS Applied Electronic Materials, 2026
    High Resolution Image Download MS PowerPoint Slide Vertical organic electrochemical transistors (vOECTs) combine high current density, large transconductance, and fast switching speeds, clearly outperforming traditional planar OECTs. These features make them highly attractive for high-sensitivity and high-frequency applications, including biosensing and neuromorphic computing. However, current fabrication methods remain complex and costly, typically requiring cleanroom facilities and advanced microfabrication techniques. Here, we introduce a low-cost, cleanroom-free approach to fabricating flexible vOECTs by thermally evaporating gold onto commercial polyimide tape. This straightforward process eliminates the need for lithography or shadow masks, simplifying device production. The resulting transistors show high transconductance, excellent ON/OFF ratios, and stable operation. Furthermore, their integration into a unipolar inverter highlights their suitability for organic electronic circuits. Overall, this work presents an accessible and scalable fabrication route for flexible vOECTs, opening opportunities for next-generation bioelectronic and computing platforms.
  • Morphological enhancement and charge recombination mitigation in non-fullerene organic solar cells through solvent vapor annealing
    Anderson E X Gavim, Rahul Murali, Md Soif Ahmed, Lavadiya Sireesha, Madduri Suresh, Bruno B M Torres, Sai S K Raavi, Natalie Banerji, Roberto M Faria, Paulo B Miranda
    Journal of Physics D Applied Physics, 2026
    This study explores the efficacy of solvent vapor annealing (SVA) in enhancing the performance of organic solar cells (OSCs) by mitigating charge recombination and improving charge extraction, which are prevalent issues limiting their efficiency. Focusing on an OSC blend with known suboptimal characteristics, we specifically examine the effects of SVA on the blend’s morphology, optical properties, and charge dynamics. Notably, SVA treatment significantly increases the short-circuit current density ( J sc ) from 17.24 ± 1.66 mA cm −2 to 26.92 ± 1.06 mA cm −2 for an optimal 30 s treatment. However, extended treatment durations inversely affect the J sc , indicating the need for precise control of the SVA protocol. The treatment also induces shifts in the optical absorption spectra and morphological changes. The impact of improved optical properties on charge photogeneration was analyzed by transfer matrix method simulations, while transient absorption, transient photovoltage (TPV) and transient photocurrent measurements helped to understand the dynamics of charge recombination. Both features explain the increase in experimental cell performance. These findings bring light to the mechanisms behind the use of SVA to enhance OSC performance and underscore its potential by careful implementation of a simple post-processing technique.
  • An unbalanced load resistor for ideal logic levels and maximum gain in organic electrochemical transistor-based unipolar inverters
    Marcos Luginieski, Bruno Bassi Millan Torres, Bianca de Andrade Feitosa, Gerwin Dijk, Alberto Salleo, Gregório Couto Faria
    Journal of Materials Chemistry C, 2026
    This paper proposes straightforward unipolar inverter circuit design guidelines and identifies a trade-off between maximum voltage gain and logic level fidelity as a function of load resistance.
  • Temperature control of the two-photon brightness and excited state properties of diimide dibenzene sulfonic-acid perylene monomers/aggregates in a binary water-dimethyl sulfoxide solvent mixture
    Danyellen D.M. Galindo, Rafael de Q. Garcia, Bruno M. Bassi, Cleber R. Mendonça, Leonardo De Boni
    Journal of Photochemistry and Photobiology A Chemistry, 2025
  • Measurement System to Determine the Seebeck Coefficient and Electrical Conductivity of Thin Films
    Gustavo G. Dalkiranis, João H. C. Bocchia, Bruno Bassi Millan Torres, Aitor F. Lopeandia, Osvaldo N. Oliveira, Gregório C. Faria
    IEEE Transactions on Instrumentation and Measurement, 2025
    Thermoelectric (TE) materials are promising for energy-generating devices, and their design depends on a fast, precise determination of their Seebeck coefficient and electrical conductivity. Herein, a low-cost setup was developed to determine the Seebeck coefficient and electrical conductivity of thin films, allowing the calculation of the power factor (PF) <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$(\text {PF}=S^{2}\sigma)$ </tex-math></inline-formula>. The system was validated by measuring the Seebeck coefficient and electrical conductivity of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS), a widely used material in organic electronics and TE generators. The results demonstrate the high resolution of our system, with obtained values of <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.1~\mu \text {V/K}$ </tex-math></inline-formula> for Seebeck coefficient, <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.1~\text {S/cm}$ </tex-math></inline-formula> for electrical conductivity, and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$0.1~\mu \text {W/K}^{2}$ </tex-math></inline-formula> for PF. A detailed description of the fabrication of the measurement setup is provided, with the aim of making thermoelectricity accessible to any research laboratory, even in places with limited budgets.
  • Non-ideal nernstian behavior in organic electrochemical transistors: fundamental processes and theory
    Bianca de Andrade Feitosa, Bruno Bassi Millan Torres, Marcos Luginieski, Douglas José Coutinho, Gregório Couto Faria
    Materials Horizons, 2024
    We propose an OECT model for steady-state behavior based on thermodynamic and electrochemical principles. It shows that it is possible to establish the origin of the relationship between the choice of channel-electrolyte and device performance.
  • Substituting Small Molecules by Polymers in Light Harvesting Capacitor: Effect on the Coherency of Photogenerated Dipoles
    Joaquim B. de Lima Filho, Florian Günther, Bruno Bassi Millan Torres, Paulo B. Miranda
    ACS Applied Polymer Materials, 2024
    High Resolution Image Download MS PowerPoint Slide We compare optical and electric properties of multilayered light harvesting capacitors (LHCs) fabricated by layer-by-layer (LbL) polyelectrolyte self-assembly. Electron donor nanolayers were coated from a solution of poly(3-potassium-6-hexanoate thiophene) (P3KHT) while electron acceptor layers were coated from a solution of either a small molecule cationic derivative of N, N ′-bis(6-aminohexil)-3,4,9,10-perilenediimide (PDI-6N) or a macromolecule obtained from a polycation of perylenediimide-functionalized polyethileneimine (PDI-PEI). Internal photogeneration of charges was probed via time-resolved transient absorption and continuous-wave photoinduced absorption spectroscopy, while coherent nanodipoles were probed via transient photocurrent measurements, fitted by an analytical equation developed under photophysical principles of LHCs. Data show that charge lifetimes do not depend on external parameters, especially load resistance and pump modulation frequency, while dipole lifetimes depend on load resistance. In addition, it is shown that LHCs based on polymeric acceptor PDI-PEI are more efficient than those based on small molecule acceptor PDI-6N, probably because the smaller acceptor interpenetrates more into the P3KHT polymeric chains, resulting in weaker coherent contribution of photogenerated dipoles to the macroscopic dielectric polarization.
  • Guidelines on Measuring Volumetric Capacitance in Organic Electrochemical Transistors
    Marcos Luginieski, Bruno B. M. Torres, Gregório C. Faria
    ACS Applied Electronic Materials, 2024
    Organic electrochemical transistors (OECTs) have been widely used in a diverse array of applications. This is primarily attributed to their remarkable ion-to-electron transduction capabilities, which are rooted in the ion uptake by the OECT channel, leading to doping/dedoping processes of the active layer, and are physically characterized by volumetric capacitance ( C *). In this study, we present a comparative analysis of the two primary techniques used to measure the volumetric capacitance in the OECTs. Although electrochemical impedance spectroscopy (EIS) is commonly employed for this purpose, it does not allow us to describe the dependency of C * on the drain voltage, thereby overlooking potential doping/dedoping inhomogeneities across the channel. To address this limitation, we explore the use of the transient current technique (TCT), which provides a straightforward approach to evaluate the volumetric capacitance and its relationships with the doping/dedoping profiles across the channel. We concluded that for V G ≫ V D, i.e., V D ≈ 0 V, both EIS and TCT can be considered for accurately measuring C *. However, for V D ≠ 0 V and V G ≈ V D, only TCT offers ways to correctly evaluate C *. Considering the diversity of the OECT community, encompassing researchers from various backgrounds, we aimed to establish comprehensive guidelines for the accurate measurement and reporting of C * in the OECTs, ensuring a standardized and rigorous approach.
  • Chitosan and chitosan/turmeric-based membranes for wound healing: Production, characterization and application
    Karoline M.L. Pacheco, Bruno B.M. Torres, Rafaela C. Sanfelice, Mardoqueu M. da Costa, Lívia Assis, Rosemarie Brandim Marques, Antônio Luiz Martins Maia Filho, Carla R. Tim, Adriana Pavinatto
    International Journal of Biological Macromolecules, 2023
  • Distinctive Behavior of Field-Effect and Redox Electrolyte-Gated Organic Transistors
    Douglas José Coutinho, Bianca de Andrade Feitosa, Henrique Frulani de Paula Barbosa, Renan Colucci, Bruno Bassi Millan Torres, Gregório Couto Faria
    Journal of Physical Chemistry C, 2023
  • Influence of the π-bridge and heteroatom on fluorene-based donor-acceptor polymers: Structure and optoelectronic properties
    Myllena S. Pereira, Luis O. Araujo, Mikaela Daros, Bruno B. M. Torres, Douglas J. Coutinho, Andreia G. Macedo, Roberto M. Faria, Paula C. Rodrigues
    Journal of Applied Polymer Science, 2023
  • From PDI BSA Monomer to Nanoaggregates: an Unchanged Two-photon Absorption Cross-section and Brightness Control relation
    Optics Infobase Conference Papers, 2022
  • Conductive Thin Films based on Sodium Alginate/PEDOT:PSS Blends
    Jorge Fernandes Filho, Samir Leite Mathias, Bruno Bassi Millan Torres, Caio Henrique Gomes, Aparecido Junior de Menezes, Rafael Henriques Longares
    Revista Virtual De Quimica, 2022
  • Induced birefringence by drop cast in EFBG ammonia sensors
    Jean Filipe Kuhne, Nathalia de Campos Prediger, Bruno Bassi Millan Torres, Rafael Carvalho Barreto, Ricardo Canute Kamikawachi
    Photonics, 2021
  • Electrical performance of PTB7-Th:PC71BM solar cell when in contact with the environment
    F.L. Araújo, D.R.B. Amorim, B.B.M Torres, D.J. Coutinho, R.M. Faria
    Solar Energy, 2020
  • Three-dimensional structures fabricated after laser-induced free radical generation in azoaromatic compounds
    A. J. G. Otuka, B. B. M. Torres, J. Dipold, D. T. Balogh, V. Tribuzi, L. De Boni, C. R. Mendonça
    Optical Materials Express, 2020
  • Bulk-heterojunction polymer photovoltaic cells manufactured using non-halogenated and non-aromatic solvent
    Lívia Maria de Castro Sousa, Guilherme da Silva Miranda, Francineide Lopes de Araújo, Bruno Bassi Millan Torres, Roberto Mendonça Faria, Debora Terezia Balogh
    Journal of Materials Science Materials in Electronics, 2020
  • Large-area flexible 2D-colloidal crystals produced directly using roll-to-roll processing
    Giovana R. Cagnani, Edna R. Spada, Leonardo D. Cagnani, Bruno B.M. Torres, Debora T. Balogh, Maria Bardosova, Roberto M. Faria
    Colloids and Surfaces A Physicochemical and Engineering Aspects, 2020
  • Effects of additive-solvents on the mobility and recombination of a solar cell based on PTB7-Th:PC71BM
    F.L. Araújo, D.R.B. Amorim, B.B.M Torres, D.J. Coutinho, R.M. Faria
    Solar Energy, 2019
  • Optical gas sensor for amines produced with etched fiber Bragg grating coated with PCDTBT:PDI thin films
    Jean Filipe Kuhne, Anderson Emanuel Ximim Gavim, Andréia Gerniski Macedo, Paula Cristina Rodrigues, Bruno Bassi M. Torres, Jeferson Ferreira de Deus, Ricardo Canute Kamikawachi
    Optics Infobase Conference Papers, 2018
  • One-pot synthesis of poly-(3-hexylthiophene) with variable degrees of molar mass and regioregularity
    W. M. Facchinatto, B. B. M. Torres, D. T. Balogh
    Journal of Polymer Research, 2016
  • One-step approach for preparing ozone gas sensors based on hierarchical NiCo2O4 structures
    Nirav Joshi, Luís F. da Silva, Harsharaj Jadhav, Jean-Claude M'Peko, Bruno Bassi Millan Torres, Khalifa Aguir, Valmor R. Mastelaro, Osvaldo N. Oliveira
    Rsc Advances, 2016
  • Synthesis of a PPV-fluorene derivative: Applications in luminescent devices
    Paula C. Rodrigues, Bruno D. Fontes, Bruno B. M. Torres, Washington S. Sousa, Gregório C. Faria, Debora T. Balogh, Roberto M. Faria, Leni Akcelrud
    Journal of Applied Polymer Science, 2015
  • Donor-acceptor copolymers with internal dipole change for organic photovoltaic applications
    Optics Infobase Conference Papers, 2012
  • Donor-acceptor copolymers with internal dipole change for organic photovoltaic applications
    Optics Infobase Conference Papers, 2012
  • Donor-acceptor copolymers with internal dipole change for organic photovoltaic applications
    Optical Instrumentation for Energy and Environmental Applications E2 2012, 2012
  • Donor-acceptor copolymers with internal dipole change for organic photovoltaic applications
    Paula C. Rodrigues, Douglas J. Coutinho, Bruno B. M. Torres, Debora T. Balogh, Leni Akcelrud, Teresa D.Z. Atvars, Roberto M. Faria
    Solid State and Organic Lighting Soled 2012, 2012
  • Regioregular improvement on the oxidative polymerization of poly-3-octylthiophenes by slow addition of oxidant at low temperature
    B. B. M. Torres, D. T. Balogh
    Journal of Applied Polymer Science, 2012
  • Donor-acceptor copolymers with internal dipole change for organic photovoltaic applications
    Optics Infobase Conference Papers, 2012