Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Large scale manufacturing of polymer solar cells (PSCs) puts a limit on thermal annealing at higher temperatures as it is detrimental to the substrates. An alternative processing condition we propose is thermal annealing of bulk heterojunction (BHJ) film in the presence of electric field (EF) at low temperatures than required for optimum device performance. Absorption studies on the BHJ blends showed increase in inter-chain interaction of semicrystalline polymer chains upon thermal annealing in EF. Systematic trends in the organization and performance of PSCs with the additional processing parameter of annealing under EF were observed. Solar cells made from BHJ blends of Medium Molecular weight polymer donor and PCBM showed a substantial increase in Jsc which was reflected in the enhancement in PCE (3.09% to 3.78%), showing a maximum at EF of 2*103 V/cm and reduction in Jsc and PCE at higher field values. To understand this decrease in PCE at higher EF values, similar treatment was carried out on solar cells made from BHJ blends of higher molecular polymer donor and PCBM blends. These devices showed improvement in Jsc and PCE (2.69% to 3.32%) and showed a maximum at 1*104 V/cm and did not show a reduction at higher EF values in the voltage range studied. Incident Photon to Charge conversion Efficiency (IPCE), light intensity dependence of Jsc, Atomic Force Microscopy imaging and dark MIS-CELIV mobility studies provide us with additional information about morphological changes in the BHJ blends induced by the EF treatment.
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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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