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Enhanced photovoltage for inverted planar heterojunction perovskite solar cells

Luo, D, Yang, W, Wang, Z, Sadhanala, A, Hu, Q, Su, R, Shivanna, R, Trindade, G, Watts, John, Xu, Z , Liu, T, Chen, K, Ye, F, Wu, P, Zhao, L, Wu, J, Tu, Y, Zhang, Y, Yang, X, Zhang, Wei, Friend, R, Gong, Q, Snaith, H and Zhu, R (2018) Enhanced photovoltage for inverted planar heterojunction perovskite solar cells Science, 360 (6396). pp. 1442-1446.

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The highest power conversion efficiencies (PCEs) reported for perovskite solar cells (PSCs) with inverted planar structures are still inferior to those of PSCs with regular structures, mainly because of lower open-circuit voltages (Voc). Here we report a strategy to reduce nonradiative recombination for the inverted devices, based on a simple solution-processed secondary growth technique. This approach produces a wider bandgap top layer and a more n-type perovskite film, which mitigates nonradiative recombination, leading to an increase in Voc by up to 100 millivolts. We achieved a high Voc of 1.21 volts without sacrificing photocurrent, corresponding to a voltage deficit of 0.41 volts at a bandgap of 1.62 electron volts. This improvement led to a stabilized power output approaching 21% at the maximum power point.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
Luo, D
Yang, W
Wang, Z
Sadhanala, A
Hu, Q
Su, R
Shivanna, R
Trindade, G
Xu, Z
Liu, T
Chen, K
Ye, F
Wu, P
Zhao, L
Wu, J
Tu, Y
Zhang, Y
Yang, X
Friend, R
Gong, Q
Snaith, H
Zhu, R
Date : 29 June 2018
DOI : 10.1126/science.aap9282
Copyright Disclaimer : Copyright 201 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science.
Depositing User : Melanie Hughes
Date Deposited : 04 Jul 2018 14:39
Last Modified : 04 Jul 2018 14:43

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