Reducing Surface Recombination by a Poly(4-vinylpyridine) Interlayer in Perovskite Solar Cells with High Open-Circuit Voltage and Efficiency

Identifying and reducing the dominant recombination processes in perovskite solar cells is one of the major challenges for further device optimization. Here, we show that introducing a thin interlayer of poly­(4-vinylpyridine) (PVP) between the perovskite film and the hole transport layer reduces no...

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Bibliographic Details
Published in:ACS omega 2018-05, Vol.3 (5), p.5038-5043
Main Authors: Yavari, Mozhgan, Mazloum-Ardakani, Mohammad, Gholipour, Somayeh, Tavakoli, Mohammad Mahdi, Taghavinia, Nima, Hagfeldt, Anders, Tress, Wolfgang
Format: Article
Language:English
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Summary:Identifying and reducing the dominant recombination processes in perovskite solar cells is one of the major challenges for further device optimization. Here, we show that introducing a thin interlayer of poly­(4-vinylpyridine) (PVP) between the perovskite film and the hole transport layer reduces nonradiative recombination. Employing such a PVP interlayer, we reach an open-circuit voltage of 1.20 V for the best devices and a stabilized efficiency of 20.7%. The beneficial effect of the PVP interlayer is proven by statistical analysis of various samples, many of those showing an open-circuit voltage larger than 1.17 V, and a 30 mV increase in average compared to unmodified samples. The reduced nonradiative recombination is proven by enhanced photo- and electroluminescence yields.
ISSN:2470-1343
2470-1343
DOI:10.1021/acsomega.8b00555