Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
We have investigated the stability under continuous illumination and bias of CH3NH3PbI3-based solar cells consisting of various types of ETL (TiO2, PCBM(C60) , C60) and HTL (spiro-OMeTAD, PTAA, ZnPc, NiO, PEDOT-PSS) layers. The study was carried out on solar cells with the following structures: Glass/FTO/TiO2/CH3NH3PbI3/HTL/Au (with HTL such as spiro-OMeTAD, PTAA, ZnPc) and Glass/ITO/HTL/CH3NH3PbI3/PCBM(C60)/BCP/Ag (with HTL such as NiO, PEDOT-PSS).
In particular, CH3NH3PbI3 films were prepared by spin coating a solution consisting of CH3NH3I and PbI2 in DMSO/DMF (40wt%), followed by dripping diethyl-ether or toluene, and finally annealed at 100ºC for 5 minutes in Ar glove box. The encapsulated solar cells were tested under the following conditions: 1 sun continuous illumination (A.M. 1.5, 100mW/cm2), with or without 390nm UV cut filter, at constant temperature (30ºC), and relative humidity (less than 15%). The parameters (Jsc, Voc, FF, power conversion efficiency) as well as the external quantum efficiency spectra of the solar cells were recorded before and after stability tests. In addition, the solar cells were characterized by XRD, SEM-EDX and optical spectroscopy also before and after stability tests.
In particular, we found that Glass/ITO/NiO/CH3NH3PbI3/PCBM(C60)/BCP/Ag solar cells are relatively more stable than the others types of solar cells including Glass/FTO/TiO2/CH3NH3PbI3/spiro-OMeTAD/Au. We speculate that the cause of the degradation under both both UV light and bias is probably related to photochemical reaction at the interfaces ETL/CH3NH3PbI3 and also in several cases at the interfaces CH3NH3PbI3/HTL. From these results, we understand that in order to improve the stability of perovskite solar cells, it is essential to introduce buffer layers. At this conference, we will present our recent experimental results and discuss the stability of CH3NH3PbI3-based solar cells.
Acknowledgement: This work has been financially supported by New Energy and Industrial Technology Development Organization (NEDO, Japan).
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