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Fermi level alignment by copper doping for efficient ITO/perovskite junction solar cells

Lu, Kai and Lei, Yan and Qi, Ruijuan and Liu, Jiang and Yang, Xiaogang and Jia, Zuxiao and Liu, Rui and Xiang, Yong and Zheng, Zhi (2017) Fermi level alignment by copper doping for efficient ITO/perovskite junction solar cells. Journal of Materials Chemistry A, 5 (48). pp. 25211-25219. ISSN 2050-7488. doi:10.1039/c7ta07828e.

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Different from band edge alignment, the Fermi level mismatch induced by band bending can manipulate charge collection at the ITO/(CH_3NH_3)_(1−x)Cu_xPbI_3 heterojunctions. In this work, we employed a feasible spin-coating process to prepare copper defect compensation in CH_3NH_3PbI_3. The related work function was shown to shift with the copper doping density by Kelvin probe force microscopy (KPFM). Next, we applied transient surface photovoltage (TSPV) spectroscopy and first-order series reactions simulations to confirm that interface charge recombination at the ITO/perovskite junction can be eliminated through Cu+ doping. Nanoelectric photoconductive AFM analysis showed enhanced charge transfer and a higher photovoltage at the ITO/Cu-perovskite junction. Owing to efficient Fermi level alignment, the ITO/(CH_3NH_3)_(1−x)Cu_xPbI_3/PCBM/Ag devices displayed high power conversion efficiencies of 15.14 ± 0.67% at ambient conditions for inverted perovskite solar cells without any hole transport layer.

Item Type:Article
Related URLs:
URLURL TypeDescription Information
Lei, Yan0000-0003-2906-0050
Liu, Jiang0000-0001-9933-0218
Yang, Xiaogang0000-0002-1142-3100
Jia, Zuxiao0000-0002-3086-9554
Zheng, Zhi0000-0002-5889-4305
Additional Information:© 2017 The Royal Society of Chemistry. Received 6th September 2017, Accepted 27th October 2017, First published on 27th October 2017. The authors thank Prof. Dunwei Wang and Dr Pinjiang Li for helpful discussion, Prof. Shiyou Chen for DFT prediction, Prof. Dejun Wang for TSPV analysis, Ms. Songzi Liu for sample preparation, and Prof. Hongsheng Wang and Dr Zhensheng Li for transient PL measurements. This work was supported by the National Natural Science Foundation of China (Grant No. 21673200, 61504117, U1604121 and 21273192), the Innovation Scientists and Technicians Troop Construction Projects of Henan Province (Grant No. 144200510014). There are no conflicts to declare.
Funding AgencyGrant Number
National Natural Science Foundation of China21673200
National Natural Science Foundation of China61504117
National Natural Science Foundation of ChinaU1604121
National Natural Science Foundation of China21273192
Henan Province Technicians Troop Construction Projects144200510014
Issue or Number:48
Record Number:CaltechAUTHORS:20171108-100927260
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83064
Deposited By: Tony Diaz
Deposited On:08 Nov 2017 18:21
Last Modified:15 Nov 2021 19:55

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