The performance and stability of both inverted and conventional organic photovoltaic devices were examined with low temperature chemically synthesized ZnO nanoparticles as electron transporting layer and MoO3 as hole transporting layer. The device efficiency and energy conversion efficiency in inverted devices were found to be 3.48% and 68%, respectively, whereas, in conventional devices these were 2.86% and 55%, respectively.
This change of efficiency in inverted and conventional devices relates with the change of flatband voltage extracted from Mott-Schottky capacitance study. The inverted device shows excellent efficiency even after 250 h in unencapsulated condition. However, the conventional device efficiency degrades very quickly compared with the inverted one. Thus, the films deposition order plays a pivotal role for fabricating a stable and high performance organic photovoltaic device.
Kundu, S., Gollu, S.R., Sharma, R., Srinivas, G., Ashok, A., Kulkarni, A.R. and Gupta, D., 2013. Device stability of inverted and conventional bulk heterojunction solar cells with MoO 3 and ZnO nanoparticles as charge transport layers. Organic Electronics, 14(11), pp.3083-3088.
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