Issue 28, 2017

Enhancement of thermal stability for perovskite solar cells through cesium doping

Abstract

Organic–inorganic hybrid perovskite solar cells are found to be sensitive to moisture, oxygen, UV light, light soaking, heat, electric field, etc. Among all these factors, thermal stability is one of the most challenging concerns affecting PSCs stability, since it is hard to avoid a temperature increase for solar cells during operation. In this work, we systematically studied the thermal stability of CsxMA1−xPbI3 film and solar cells. The introduction of Cs into the precursor solution would inevitably accelerate the film deposition rate, resulting in decreased grain size and more Cs atoms in the film than in the precursors. The study on thermal stability illustrated that perovskite degradation was highly related to the amount of oxygen in the air. A small amount of Cs doping (x = 0.09) was beneficial for better thermal stability. In addition, Cs doping also enhanced the device performance. The improvement of short-circuit currents came from the increased film thickness, which was due to the faster deposition rate for Cs doped samples. Besides, Cs doping was vital to suppress the trap states in the film since the trap states were related to halide deficiency during thermal annealing. At last, the final performance of Cs0.09MA0.91PbI3 reached 18.1%, with a JSC of 22.57 mA cm−2, VOC of 1.06 V, FF of 0.76.

Graphical abstract: Enhancement of thermal stability for perovskite solar cells through cesium doping

Supplementary files

Article information

Article type
Paper
Submitted
21 dec 2016
Accepted
10 mrt 2017
First published
20 mrt 2017
This article is Open Access
Creative Commons BY license

RSC Adv., 2017,7, 17473-17479

Enhancement of thermal stability for perovskite solar cells through cesium doping

G. Niu, W. Li, J. Li, X. Liang and L. Wang, RSC Adv., 2017, 7, 17473 DOI: 10.1039/C6RA28501E

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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