Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Recently, Organic-inorganic perovskite solar cells have attracted much attention for a high power conversion efficiency and low cost solar cell. Perovskite solar cells consist of n-type electron transport layer, intrinsic perovskite and p-type hole transport layer. Thus, the device structure is a kind of p-i-n junction. Owing to carrier life time is not affected by injection level in p-i-n junction, perovskite solar cells could keep high voltage under low illuminance condition. Therefore, we investigated characteristics of perovskite solar cells under low illuminance conditions such as indoor lighting. First, we investigated mesostructured cells which include mesoporous TiO2 layer in device structure. As a result, the open-circuit voltage of perovskite solar cells remained around 80% of AM1.5 under 0.1 mW/cm2 (100 lux) illumination which is like indoor lighting. We also investigated internal resistance of perovskite solar cells by impedance spectroscopy. Under low illuminance conditions, transmission line (TL) was observed in low frequency part of the Nyquist plot. It was reported that TL behavior is arisen from electron transport resistance in solar cells. Therefore, it was suggested electron transport resistance in perovskite solar cells increased under low illuminance conditions. TiO2 layer is suggested because of the increase of internal resistance under low illuminance conditions. TiO2 is naturally an insulating material but it show conductive behavior by filling the trap sites by injected carriers. We assume that TiO2 acts as a high resistance layer under low illuminance conditions which cannot generate enough carriers to filling the trap sites. We examined planar structure solar cell which has no mesoporous TiO2 layer. As a result, planar cells could keep higher voltage than the mesostructured cells under low illuminance conditions. TL behavior was not observed in Nyquist plot for the planar cells. These results indicate planar structure is suitable for low illuminance applications in perovskite solar cells.
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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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