The CsPbI2Br perovskite solar cells based on carbon electrode (CE) are considered to be low-cost and stable devices. Nevertheless, the insufficient contact and energy level mismatch in the interface of CsPbI2Br/CE hinder the hole extraction and limit the enhancement of cell efficiency. Herein, a carbon black (CB) interlayer was introduced between the CsPbI2Br and CE. [1] The hole extraction was facilitated due to the larger contact area and suitable energy band alignment in the CsPbI2Br/CB interface. Moreover, the carbon based CsPbI2Br solar cells maintained over 90% of original efficiency after constant 85 oC heating for 2000 hours, showing excellent thermal stability of carbon based CsPbI2Br solar cells. Further investigation indicated the diffusion of CB nanoparticles from CE or CB layer to CsPbI2Br film after a certain period of time. We disclosed the formation of a CB-CsPbI2Br bulk heterojunction structure due to the carbon diffusion, which resulted in an efficiency enhancement. As a result, a high efficiency of 13.13% was achieved for carbon based CsPbI2Br solar cells. This work indicates that the diffusion of CB nanoparticles in CB-contained perovskite solar cells is universal and inevitable, although this kind of diffusion results in the enhancement of the cell efficiency.

Carbon black interlayer facilitates hole extraction and improves the efficiency of carbon based CsPbI2Br solar cells

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Carbon black interlayer facilitates hole extraction and improves the efficiency of carbon based CsPbI2Br solar cells

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