Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Polymer solar cells (PSCs) exceeding 10% power conversion efficiency have been reported recently [1-3]. This has been made possible by a focussed research on efficiency enhancement of PSCs, through modification of the active layer and the use of charge selective interlayers. However practical implementation also requires a detailed understanding on the effects of processing such as solvent additives and thermal annealing [4]. PTB7-Th:PC71BM blend is one of the mostly reported high efficiency polymer bulk heterojunction (BHJ) systems with the potential benefits of solution processability and flexibility. Studies on thermal annealing effects on the PTB7-Th:PC71BM BHJs can identify the possibility of using these polymer solar cells for high temperature applications in desert regions and space research. This can also provide valuable insight towards the development of novel thermally stable, cross-linkable donor and acceptor blends. As the thermal annealing temperature increased from room temperature to 150 0C, the PCE of the PTB7-Th-PC71BM inverted solar cells, monotonically decreased from 8.8 % to 5.5 % mainly due to a drop in short circuit current density and fill factor. Microstructural (characterized by Grazing incidence X-ray diffraction, and Micro-Raman), morphological (Atomic force microscopy and High Resolution –Transmission Electron Microscopy) and electronic (by space charge limited hole/electron mobility, time resolved photoluminescence and photovoltaic measurements) contributions are explored in detail to account for this drop in efficiency.
References:1. L.K. Jagadamma et al Adv. Energy Mater. 2015, 5, 1500204
2. He Z et al Nat. Photon, 2015, 9, 174-179.
3. Liu Y et al Nat. Commun. 2014, 5, 5293
4. Jorgensen M et al Solar Energy Materials & Solar Cells 2008, 92, 686–714
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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