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COMPARISON OF PERFORMANCES OF ORGANIC PHOTOVOLTAIC CELLS USING SubPc AS CENTRAL AMBIPOLAR LAYER IN TERNARY STRUCTURES AND AS ELECTRON ACCEPTOR IN BINARY STRUCTURES
摘要： We compare the performances of organic photovoltaic cells (OPVCs) based on binary and ternary planar heterojunctions. The organic active layers are pentathiophene (5T), subphthalocyanine (SubPc) and fullerene (C60). SubPc being an ambipolar material we used it either as electron acceptor in binary OPVCs or as central layer in ternary cells in order to increase the efficiency of OPVCs using 5T as electron donor. So, the different OPVC configurations were 5T/C60, 5T/SubPc and 5T/SubPc/C60. The effect of the different organic layer thicknesses on the device performances was studied. In order to understand the behavior of the different OPVC configurations, we proceeded with a morphological study. The influence of the high roughness of the 5T layer on the OPVCs performances is discussed. The best OPVCs performances are obtained with the binary structure 5T/SubPc. Its maximum efficiency corresponds to an increase of 50% compared to the OPVC based on the couple 5T/C60. External Quantum Efficiency measurements show that both layers participate to the current generation. The efficiency increase is mainly due to the increase of the open circuit voltage (Voc). In the case of ternary OPVCs, Voc is limited by the band structure of 5T and C60, moreover, the efficiency is also limited by the poor charge collection efficiency of the ternary structure and the series resistance of the three stacked organic layers.
关键词： Organic photovoltaic cells,ternary structures,pentathiophene,subphthalocyanine,binary structures
更新于2025-09-19 17:13:59
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Ester-substituted Pentathiophene Copolymer based Sky-blue Semitransparent Solar Cells for Building Windows
摘要： For oligothiophene-based donor polymers, the reports of pentathiophene are rare, while other oligothiophene (bi-, ter- and quaterthiophene) have been broadly studied. Here, we synthesized one wide-band-gap (1.88 eV) polymer PFTzTT-3TC, based on ester-substituted pentathiophene and benzotriazole. PFTzTT-3TC: ITIC (1.0:1.0) -based polymer photovoltaic cells exhibited best PCE of 8.21% and Voc of 0.90 V without additive (such as DIO, 1-CN) or post-treatment. These are the highest PCE and Voc for ester-substituted pentathiophene-based devices to date. Furthermore, semitransparent polymer photovoltaic cells with an active blend of PFTzTT-3TC: ITIC (1.0:1.0) demonstrate a similar Voc of 0.89V and a PCE of 6.43% with an AVT of 26.77% and an AT of 30.58% and CIE (0.25, 0.21). The sky-blue of semitransparent devices is useful for photosynthesis in plants and visual comfort in human and make it suitble for building windows.
关键词： benzotriazole,ester-substituted pentathiophene,organic photovoltaic,building windows,semitransparent polymer photovoltaic cells
更新于2025-09-12 10:27:22