화학공학소재연구정보센터
학회 한국고분자학회
학술대회 2019년 봄 (04/10 ~ 04/12, 부산컨벤션센터(BEXCO))
권호 44권 1호
발표분야 신진연구자 특별 심포지움
제목 Ambient Air Stable Halide Perovskite Solar Cells via Lattice Strain Relaxation
초록 The recent record power conversion efficiency of 23.7% for single junction perovskite solar cells provides the optimistic future of this field. However, the degradation of perovskite solar cells in the presence of trace water and oxygen poses a challenge for their commercial impact given the appreciable permeability of cost-effective encapsulants. Here, we report that, in single-cation/halide perovskites, local lattice strain facilitates the formation of vacancies and that cation/halide mixing suppresses their formation via strain relaxation. We then show that judiciously selected dopants can maximize the formation energy of defects responsible for degradation. Cd-containing cells show an order of magnitude enhanced unencapsulated stability compared to state-of-art mixed perovskite solar cells, for both shelf storage and maximum power point operation in ambient air at a relative humidity of 50%. We also provide the golden rule of the defect engineering concept.
저자 김정환
소속 한국과학기술(연)
키워드 Ambient air stability; perovskite solar cells; lattice strain
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