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Influence of the density of states on the open-circuit voltage in small-molecule solar cells
Galindo Lorente, Sergi; Ahmadpour Sayyar, Mehrad; Guerling, Luis Guillermo; Marsal Vinade, Albert; Voz Sánchez, Cristóbal; Alcubilla González, Ramón; Puigdollers i González, Joaquim
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. MNT - Grup de Recerca en Micro i Nanotecnologies
Open-circuit voltages are strongly dependent on the density-of-states in solar cells based on disordered semiconductors. In this work, organic solar cells based on tetraphenyldibenzoperiflanthene and fullerene C-70 with a bilayer structure were fabricated to investigate the variation in the density-of-states with the substrate temperature during deposition of the donor. The maximum open circuit voltage was reached at a substrate temperature of 60 degrees C. Organic thin-film transistors were also fabricated to study their electrical properties, such as the mobility and the density-of-states. Finally, an organic solar cell with p-i-n structure was fabricated at the optimized substrate temperature, and a power conversion efficiency of almost 4% was obtained. (C) 2014 Elsevier B.V. All rights reserved.
Àrees temàtiques de la UPC::Energies::Energia solar fotovoltaica::Cèl·lules solars
Àrees temàtiques de la UPC::Enginyeria electrònica
Solar cells
Density of states
Open circuit voltage
Organic solar cell
Small molecule
OTFT
THIN-FILM TRANSISTORS
CONVERSION EFFICIENCY
PENTACENE
MOBILITY
DONORS
Cèl·lules solars
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