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Comprehensive understanding of heat-induced degradation of triple-cation mixed halide perovskite for a robust solar cell
East China Normal Univ, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, Faculty of Science & Engineering.
Soochow Univ, Peoples R China.
Zhejiang Univ, Peoples R China.
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2018 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 54, p. 218-226Article in journal (Refereed) Published
Abstract [en]

The triple-cation mixed halide perovskite Cs-0.05(MA(0.17)FA(0.83))(0.95)Pb(I0.83Br0.17)(3) emerges as one of the most promising candidates for photovoltaics due to superior optoelectronic properties, but the thermal stability is still a major challenge for the viability of perovskite solar cells towards commercialization. Herein, we firstly explore the thermal response of the photovoltaic performances to access device physical changes. It is shown that the efficiency loss originates from decreased charge mobility, increased trap density and generation of PbI2 charge recombination centers near the interface. In-depth analysis of evolutions in morphology, chemical composition, dynamic and electronic structure of the perovskite layer at the nanometer scales indicates that it is initial dangling bonds and vacancies on the imperfect surfaces decrease the activation energy and cause the perovskite decomposition in a layer-by-layer pathway sequentially from the film surface to bulk. Based on the results, a strategy of surface passivation to improve the thermal stability is demonstrated and discussed. This work for the first time provides insights into the physical and chemical change of such triple-cation perovskite and indicates that more effort should be invested in surface treatment for enhancing perovskite device stability.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2018. Vol. 54, p. 218-226
Keywords [en]
Triple-cation mixed halide perovskite; Thermal-induced degradation; Stability; Efficiency; Perovskite solar cell
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-153365DOI: 10.1016/j.nanoen.2018.10.011ISI: 000450974700025OAI: oai:DiVA.org:liu-153365DiVA, id: diva2:1271835
Note

Funding Agencies|National Natural Science Foundation of China [11604099, 21875067, 51811530011, 11474214]; Fundamental Research Funds for the Central Universities; Shanghai Science and Technology Innovation Action Plan [17JC1402500]; Swedish Research Council [2016-05498]; Swedish Foundation for International Cooperation in Research and Higher Education (STINT) [CH2017-7163]

Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2019-03-22

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