Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
Publication date: 27th October 2017
We have already reported that mixed metal perovskite (MAPbSnI3) shows photoconversion in IR region. Due to the light harvesting properties up to 1000 nm, high short circuit current (Jsc) was observed(1). However, the open-circuit voltage (Voc) was lower than 0.3 V and the estimated voltage loss was 0.6-7V, which was much larger than that of MAPbI3 (0.4 V). The main purpose of this work is to increase the efficiency of mixed metal Sn/Pb perovskite solar cells and is to clarify effect of passivation on TiO2 surface .We focused on the interface between TiO2 and perovskite layer, because we have already reported suppressed effect of interfacial traps between them. Our investigation of thermally stimulated current measurement on the substrate which mimicked the interface of TiO2 and perovskite reveals that Ti-O-Sn linkage on the interface created traps which cause charge recombination. This was further confirmed by transient absorption spectroscopic measurements. So as to avoid the formation of Ti-O-Sn linkages, the surface of compact TiO2 (c-TiO2) was passivated with [6,6]-phenyl-C61-butyric acid (PCBA) before the Sn/Pb perovskite layer was fabricated. Solar cells were fabricated in the device configuration “FTO/c-TiO2 passivated with PCBA /CH3NH3Sn0.3Pb0.7I3/ P3HT/Au. Because of the PCBA passivation Voc increased from minimum of 0.3 V to maximum of 0.5 V.
Reference
1. Yuhei Ogomi, Atsushi Morita, Syota Tsukamoto, Takahiro Saitho, Naotaka Fujikawa, Qing Shen, Taro Toyoda, Kenji Yoshino, Shyam S. Pandey, Tingli Ma, and Shuzi Hayase, J. Phys. Chem. Lett. 2014, 5, 1004−1011
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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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