Reducing Open-Circuit Voltage Losses in All-Inorganic Perovskite Cells by Dedoping

Peng Z, Tian J, Zhang K, These A, Xie Z, Zhao Y, Osvet A, Guo F, Lüer L, Li N, Brabec C (2023)

Publication Type: Journal article

Publication year: 2023

Journal

Pages Range: 2077-2085

DOI: 10.1021/acsenergylett.3c00173

Abstract

CsPbI2Br is an attractive photovoltaic material due to its promising optoelectronic properties. However, the corresponding perovskite solar cells (PSCs) with p-i-n configuration suffer from low open-circuit voltage (VOC) and fill factor (FF), limiting their application in tandem solar cells. Here, we propose using the fullerene ICBA as the electron charge transporting layer (ETL), forming a better interfacial contact and enhancing the internal quasi-Fermi level splitting (QFLS). A further reduction of VOC losses of around 0.1 V was achieved by an ultrathin phenethylammonium chloride (PEACl) layer between the perovskite and the ETL. We precisely study the VOC improvement and find that passivation of surface recombination contributes only 20 mV, while more importantly, a major increase of 80 mV is achieved by dedoping the perovskite surface, which removes a non-negligible electron extraction barrier. Our results give helpful direction regarding how to further improve VOC in p-i-n perovskite cells.

Authors with CRIS profile

Additional Organisation(s)

Involved external institutions

Jinan University China (CN)

How to cite

APA:

Peng, Z., Tian, J., Zhang, K., These, A., Xie, Z., Zhao, Y.,... Brabec, C. (2023). Reducing Open-Circuit Voltage Losses in All-Inorganic Perovskite Cells by Dedoping. ACS Energy Letters, 2077-2085. https://doi.org/10.1021/acsenergylett.3c00173

MLA:

Peng, Zijian, et al. "Reducing Open-Circuit Voltage Losses in All-Inorganic Perovskite Cells by Dedoping." ACS Energy Letters (2023): 2077-2085.

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