[논문]In situ TEM observation of the heat–induced degradation of single– and triple–cation planar perovskite solar cells

Seo, You-Hyun; Kim, Jun Hee; Kim, Do-Hyung; Chung, Hee-Suk; Na, Seok-In

doi:10.1016/j.nanoen.2020.105164

[해외논문] In situ TEM observation of the heat–induced degradation of single– and triple–cation planar perovskite solar cells

Nano energy, v.77, 2020년, pp.105164 -

Seo, You-Hyun (Department of Flexible and Printable Electronics and LANL-CBNU Engineering Institute-Korea, Jeonbuk National University) , Kim, Jun Hee (Korea Basic Science Institute) , Kim, Do-Hyung (KEPCO Research Institute, Korea Electric Power Corporation) , Chung, Hee-Suk (Korea Basic Science Institute) , Na, Seok-In (Department of Flexible and Printable Electronics and LANL-CBNU Engineering Institute-Korea, Jeonbuk National University)

Abstract ▼ AI-Helper

Abstract Benefiting from the structural stability of the formamidium and Cs cation by tuning the methylammonium while partially replacing iodine with Br, the triple–cation perovskite solar cells (PSCs) have shown improved power conversion efficiency (PCE) and thermal stability, compared to single–cation PSCs. However, the thermal stability of the triple–cation perovskite is not fully understood, which limits the further development of device performance and stability of the PSCs. This paper reports the thermal–induced effects on the photovoltaic performances for Csx(FAyMA(1–y))(1–x)Pb(IzBr(1–z))3 (Cs/FA/MA)–PSCs as compared to MAPbI3 (MA)–PSCs, and further investigate the degradation phenomena directly by using real–time in situ transmission electron microscopy (TEM). This in situ TEM observation shows the different degradation phenomena in the MA– and Cs/FA/MA–PSCs, and confirms the correlation of its effects on the device performance. Furthermore, analyses of the elements and crystal structures reveal distinct differences in the decomposed products between MA– and Cs/FA/MA–PSC, and these relevant thermal–induced degradation mechanisms are also discussed in detail. This study will potentially help understanding of the thermal degradation of PSCs, and can be used for the future development of high–performance and stable PSCs. Highlights Heat-induced degradation of single– and triple–PSCs were observed via in situ TEM. The dark voids and Pb particles were found to be critical under thermal stress. In-situ TEM results identified the different degradation mechanism between both PSCs. This work provides clues as to how to protect against the thermal degradation of PSCs.

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