Approaching the Shockley-Queisser limit for fill factors in lead-tin mixed perovskite photovoltaics

Author(s)
K. D.G.I. Jayawardena, R. M.I. Bandara, M. Monti, E. Butler-Caddle, T. Pichler, H. Shiozawa, Z. Wang, S. Jenatsch, S. J. Hinder, M. G. Masteghin, M. Patel, H. M. Thirimanne, W. Zhang, R. A. Sporea, J. Lloyd-Hughes, S. R.P. Silva
Abstract

The performance of all solar cells is dictated by charge recombination. A closer to ideal recombination dynamics results in improved performances, with fill factors approaching the limits based on Shockley-Queisser analysis. It is well known that for emerging solar materials such as perovskites, there are several challenges that need to be overcome to achieve high fill factors, particularly for large area lead-tin mixed perovskite solar cells. Here we demonstrate a strategy towards achieving fill factors above 80% through post-treatment of a lead-tin mixed perovskite absorber with guanidinium bromide for devices with an active area of 0.43 cm2. This bromide post-treatment results in a more favorable band alignment at the anode and cathode interfaces, enabling better bipolar extraction. The resulting devices demonstrate an exceptional fill factor of 83%, approaching the Shockley-Queisser limit, resulting in a power conversion efficiency of 14.4% for large area devices.

Organisation(s)
Electronic Properties of Materials
External organisation(s)
University of Surrey, University of Warwick, Czech Academy of Sciences, University of Oxford, Fluxim AG, National Physical Laboratory (NPL)
Journal
Journal of Materials Chemistry A
Volume
8
Pages
693-705
No. of pages
13
ISSN
2050-7488
DOI
https://doi.org/10.1039/c9ta10543c
Publication date
01-2020
Peer reviewed
Yes
Austrian Fields of Science 2012
Materials physics, Surface physics, Solid state physics, Renewable energy
ASJC Scopus subject areas
, ,
Portal url
https://ucris.univie.ac.at/portal/en/publications/approaching-the-shockleyqueisser-limit-for-fill-factors-in-leadtin-mixed-perovskite-photovoltaics(58d305ba-01e3-4cbb-8dc5-6ce6f24d829c).html