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Ligand-assisted cation-exchange engineering for high-efficiency colloidal Cs1−xFAxPbI3 quantum dot solar cells with reduced phase segregation

Hao, Mengmeng, Bai, Yang, Zeiske, Stefan, Ren, Long, Liu, Junxian, Yuan, Yongbo, Zarribi, Nasim, Cheng, Ningyan, Ghasemi, Mehri, Chen, Peng , Lyu, Miaoqiang, He, Dongxu, Yun, Jung-Ho, Du, Yi, Wang, Yun, Ding, Shanshan, Arming, Ardalan, Meredith, Paul, Liu, Gang, Cheng, Hui-Ming and Wang, Lianzhou (2020) Ligand-assisted cation-exchange engineering for high-efficiency colloidal Cs1−xFAxPbI3 quantum dot solar cells with reduced phase segregation Nature Energy.

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Abstract

The mixed caesium and formamidinium lead triiodide perovskite system (Cs1−xFAxPbI3) in the form of quantum dots (QDs) offers a pathway towards stable perovskite-based photovoltaics and optoelectronics. However, it remains challenging to synthesize such multinary QDs with desirable properties for high-performance QD solar cells (QDSCs). Here we report an effective oleic acid (OA) ligand-assisted cation-exchange strategy that allows controllable synthesis of Cs1−xFAxPbI3 QDs across the whole composition range (x = 0–1), which is inaccessible in large-grain polycrystalline thin films. In an OA-rich environment, the cross-exchange of cations is facilitated, enabling rapid formation of Cs1−xFAxPbI3 QDs with reduced defect density. The hero Cs0.5FA0.5PbI3 QDSC achieves a certified record power conversion efficiency (PCE) of 16.6% with negligible hysteresis. We further demonstrate that the QD devices exhibit substantially enhanced photostability compared with their thin-film counterparts because of suppressed phase segregation, and they retain 94% of the original PCE under continuous 1-sun illumination for 600 h.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering
Authors :
NameEmailORCID
Hao, Mengmeng
Bai, Yang
Zeiske, Stefan
Ren, Long
Liu, Junxian
Yuan, Yongbo
Zarribi, Nasim
Cheng, Ningyan
Ghasemi, Mehri
Chen, Peng
Lyu, Miaoqiang
He, Dongxu
Yun, Jung-Ho
Du, Yi
Wang, Yunyun.wang@surrey.ac.uk
Ding, Shanshan
Arming, Ardalan
Meredith, Paul
Liu, Gang
Cheng, Hui-Ming
Wang, Lianzhou
Date : 20 January 2020
Funders : Welsh European Funding Office and European Regional Development
DOI : doi.10.1038/s41560-019-0535-7
Grant Title : Sêr Cymru II
Copyright Disclaimer : Copyright © 2020, Springer Nature
Depositing User : James Marshall
Date Deposited : 27 Feb 2020 09:58
Last Modified : 29 May 2020 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/853838

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