Reducing surface recombination by a poly(4-vinylpyridine) interlayer in perovskite solar cells with high open-circuit voltage and efficiency

Yavari, M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1021/acsomega.8b00555
  3. Publisher: American Chemical Society , 2018
  4. Abstract:
  5. 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. © Copyright 2018 American Chemical Society
  6. Keywords:
  7. Perovskite ; Solar cells ; Methylammonium lead
  8. Source: ACS Omega ; Volume 3, Issue 5 , 2018 , Pages 5038-5043 ; 24701343 (ISSN)
  9. URL: https://pubs.acs.org/doi/10.1021/acsomega.8b00555