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Electrochemical and atomic force microscopy investigations of the effect of CdS on the local electrical properties of CH3NH3PbI3:CdS perovskite solar cells

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Abstract

The effects of the incorporated CdS on the local optoelectronic properties of CH3NH3PbI3:CdS bulk heterojunction (BHJ) perovskite solar cells (PSCs) are studied using Kelvin probe force microscopy (KPFM), conductive atomic force microscopy (c-AFM) and electrochemical impedance spectroscopy (EIS). The KPFM and c-AFM results clearly show that as the amount of incorporated CdS increases, the incorporated CdS creates more uniform and compact perovskite films. Moreover, the incorporated CdS nanoparticles lead to a higher surface potential and a more uniform and higher photocurrent distribution on the CH3NH3PbI3:CdS active layer, which indicates that the CdS nanoparticles can lead to more effective photo-generated electron transfer from the CH3NH3PbI3 to the CdS and proves experimentally that the CdS nanoparticles can form a continuous photo-generated electron transport channel. The EIS results show that the CdS can effectively decrease the contact resistances at the active layer/electron transport layer and the active layer/hole transport layer interfaces and it helps in the charge collection of the cells, which further confirms that the CdS nanoparticles can play the role of transporting electrons. Our study provides a nanoscale understanding of the improved device performance of CH3NH3PbI3:CdS PSCs.

Graphical abstract: Electrochemical and atomic force microscopy investigations of the effect of CdS on the local electrical properties of CH3NH3PbI3:CdS perovskite solar cells

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Publication details

The article was received on 25 Sep 2017, accepted on 04 Nov 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC04377E
Citation: J. Mater. Chem. C, 2017, Advance Article
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    Electrochemical and atomic force microscopy investigations of the effect of CdS on the local electrical properties of CH3NH3PbI3:CdS perovskite solar cells

    M. Guo, F. Li, L. Ling and C. Chen, J. Mater. Chem. C, 2017, Advance Article , DOI: 10.1039/C7TC04377E

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