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Monolithic Wide Band Gap Perovskite/ Perovskite Tandem Solar Cells with Organic Recombination Layers

Sheng, R, Hörantner, MT, Wang, Z, Jiang, Y, Zhang, Wei, Agosti, A, Huang, S, Hao, X, Ho-Baillie, A, Green, M and Snaith, HJ (2017) Monolithic Wide Band Gap Perovskite/ Perovskite Tandem Solar Cells with Organic Recombination Layers Journal of Physical Chemistry C, 121 (49). pp. 27256-27262.

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We demonstrate a monolithic tandem solar cell by sequentially depositing a higher-bandgap (2.3 eV) CH3NH3PbBr3 sub-cell and a lower-bandgap (1.55 eV) CH3NH3PbI3 sub-cell bandgap perovskite cells, in conjugation with a solution-processed organic charge carrier recombination layer, which serves to protect the underlying sub-cell and allows for voltage addition of the two sub-cells. Owing to the low-loss series connection, we achieve a large open-circuit voltage of 1.96 V. Through optical and electronic modelling, we estimate the feasible efficiency of this device architecture to be 25.9 %, achievable with integrating a best-in-class CH3NH3PbI3 sub cell and a 2.05 eV wide bandgap perovskite cell with an optimised optical structure. Compared to previous reported all-perovskite tandem cells, we solely employ Pb-based perovskites, which although have wider band gap than Sn based perovskites, are not at risk of instability due to the unstable charge state of the Sn2+ ion. Additionally, the bandgap combination we use in this study could be an advantage for triple junction cells on top of silicon. Our findings indicate that wide band gap all-perovskite tandems could be a feasible device structure for higher efficiency perovskite thin-film solar cells.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Sheng, R
Hörantner, MT
Wang, Z
Jiang, Y
Agosti, A
Huang, S
Hao, X
Ho-Baillie, A
Green, M
Snaith, HJ
Date : 19 September 2017
DOI : 10.1021/acs.jpcc.7b05517
Copyright Disclaimer : This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry, copyright © American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see
Depositing User : Melanie Hughes
Date Deposited : 03 Oct 2017 10:41
Last Modified : 19 Sep 2018 02:08

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