Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.007
Publication date: 27th October 2017
Degradation Mechanism of Perovskite Solar Cells under Standard Test Conditions
Chuanjiang Qin,1,2* Toshinori Matsushima,1,2 and Chihaya Adachi1,2*
1OPERA, Kyushu University, 744 Motooka, Nishii, Fukuoka, 819-0395, Japan
2 Japan Science and Technology Agency (JST), ERATO, Adachi Molecular Exciton Engineering Project, 744 Motooka, Nishii, Fukuoka, 819-0395, Japan
*Corresponding authors. Email: cjqin@opera.kyushu-u.ac.jp;adachi@cstf.kyushu-u.ac.jp
Organic-inorganic hybrid halide perovskites have emerged as an interesting class of materials that have excellent photovoltaic properties for application to solar cells. In the last four years, the power conversion efficiency of perovskite solar cells (PSCs) over 20% has recently been realized through systematic optimization of materials and fabrication processes. However, the stability of PSCs is just beginning to be studied, and the actual degradation mechanisms of PSCs are not well understood. Here, we firstly investigate the degradation mechanisms of CH3NH3PbI3-based PSCs using a thermally stimulated current technique, which is a versatile technique used to analyze carrier traps in inorganic and organic materials. We observed that a large density of hole traps is formed in PSCs degraded by continuous solar illumination and that the formation of hole traps is strongly related to the stability.1 We further proved that exposure to moisture could accelerate degradation of perovskite under continous operation condition. One source of the traps is metallic lead resulting from photodegradation of CH3NH3PbI3 under continous light irradiation. By virtue of multifunctional benzoquinone additive which could efficiently suppress the formation of Frenkel defect-metallic lead, we greatly extended the lifetime of PSCs under standard laboratory weathering testing (ISOS-L-1 Laboratory) with a light intensity of 100 mW cm-2 without using a UV filter from 150 hours to 4000 hours.2 Futhermore, we systematically studied the device stability with different perovskites absorbers, and revealed influrence of phase transition on the device stability. Finally, efficient and thermally stable PSCs were realized under standard thermal cycling test (ISOS-T-1 Thermal Cycling).3
References
[1] C. Qin, T. Matsushima, T. Fujihara, W. J. Potscavage, Jr., C. Adachi, Degradation mechanisms of solution-processed planar perovskite solar cells: thermally stimulated current measurement for analysis of carrier traps, Advanced Materials, 2016, 28, 466-471.
[2] C. Qin, T. Matsushima, T. Fujihara, C. Adachi, Multifunctional benzoquinone additive for efficient and stable planar perovskite solar cells, Advanced Materials, 2017, 29, 1603808.
[3] C. Qin, T. Matsushima, T. Fujihara, C. Adachi, under revision.
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