Nanoporous p-type NiOx electrode for p-i-n inverted perovskite solar cell toward air stability

Publication date: Available online 10 February 2018
Source:Materials Today
Author(s): Sawanta S. Mali, Hyungjin Kim, Hyun Hoon Kim, Sang Eun Shim, Chang Kook Hong
Designing air-stable perovskite solar cells (PSCs) is a recent trend in low-cost photovoltaic technology. Metal oxide-based electron transporting layers (ETLs) and hole transporting layers (HTLs) have attracted tremendous attention in PSCs, because of their excellent air stability, high electron mobility, and optical transparency. Herein, we report a co-precipitation method for the synthesis of p-type nanoporous nickel oxide (np-NiOx) thin films as the HTL for inverted (p-i-n) PSCs. The best-performing p-i-n PSC having np-NiOx HTL, (FAPbI3)0.85(MAPbBr3)0.15 (herein FAPbI3 stands for formamidinium lead iodide and MAPbBr3 stands for methylammonium lead bromide) perovskite and phenyl-C61-butyric acid methyl ester (PCBM)/ZnO ETL exhibited a 19.10% (±1%) power conversion efficiency (PCE) with a current density (JSC) of 22.76 mA cm⁻², open circuit voltage (VOC) of 1.076 V and fill factor (FF) of 0.78 under 1 sun (100 mW cm⁻²). Interestingly, the developed p-i-n PSCs based on p-type NiOx and n-type ZnO could retain >80% efficiency after 160 days, which is much higher than conventional PEDOT:PSS HTL-based PSCs. Our findings provide air-stable perovskite solar cells with high efficiency.

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