We report a bidirectional, treated graphene oxide electrode-based organic bulk heterojunction solar cell. The nature of interfaces in the photoactive region (between PTB7/PC71BM), charge transport, and the role of treated graphene's transparency in the device performance are investigated.
Use of treated graphene reduces the sheet resistance (200-75 Ω/sq) of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate thin film and improves the organic solar cell performance over a wide spectral range (250-750 nm).
Due to: 1) the charge neutrality between PTB7 and PC71BM and 2) lowering of defect states in the electron collection layer, the overall solar cell power conversion efficiency (η) reaches 8.4% ± 0.23%; a fill factor of 69.5%, short-circuit current density of ~ 16.1 mA· cm-2, and internal quantum efficiency of ~ 68.8%.
Maity, S. and Thomas, T., 2018. Hole-Collecting Treated Graphene Layer and PTB7: PC₇₁BM-Based Bulk-Heterojunction OPV With Improved Carrier Collection and Photovoltaic Efficiency. IEEE Transactions on Electron Devices, (99), pp.1-7.
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