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DOI10.1039/c6ee03474h
Indirect to direct bandgap transition in methylammonium lead halide perovskite
Wang T.; Daiber B.; Frost J.M.; Mann S.A.; Garnett E.C.; Walsh A.; Ehrler B.
发表日期2017
ISSN17545692
起始页码509
结束页码515
卷号10期号:2
英文摘要Methylammonium lead iodide perovskites are considered direct bandgap semiconductors. Here we show that in fact they present a weakly indirect bandgap 60 meV below the direct bandgap transition. This is a consequence of spin-orbit coupling resulting in Rashba-splitting of the conduction band. The indirect nature of the bandgap explains the apparent contradiction of strong absorption and long charge carrier lifetime. Under hydrostatic pressure from ambient to 325 MPa, Rashba splitting is reduced due to a pressure induced reduction in local electric field around the Pb atom. The nature of the bandgap becomes increasingly more direct, resulting in five times faster charge carrier recombination, and a doubling of the radiative efficiency. At hydrostatic pressures above 325 MPa, MAPI undergoes a reversible phase transition resulting in a purely direct bandgap semiconductor. The pressure-induced changes suggest epitaxial and synthetic routes to higher efficiency optoelectronic devices. © The Royal Society of Chemistry 2017.
英文关键词Carrier lifetime; Charge carriers; Efficiency; Electric fields; Hydraulics; Hydrostatic pressure; Lead; Optoelectronic devices; Perovskite; Band-gap semiconductors; Bandgap transition; Charge carrier recombination; Halide perovskites; Local electric field; Radiative efficiency; Reversible phase transition; Spin-orbit couplings; Energy gap; electric field; equipment; halide; hydrostatic pressure; perovskite; phase transition
语种英语
来源期刊Energy & Environmental Science
文献类型期刊论文
条目标识符http://gcip.llas.ac.cn/handle/2XKMVOVA/190534
作者单位Center for Nanophotonics, FOM Institute AMOLF, Science Park 104, Amsterdam, 1098 XG, Netherlands; Department of Materials, Imperial College London, London, SW7 2AZ, United Kingdom
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Wang T.,Daiber B.,Frost J.M.,et al. Indirect to direct bandgap transition in methylammonium lead halide perovskite[J],2017,10(2).
APA Wang T..,Daiber B..,Frost J.M..,Mann S.A..,Garnett E.C..,...&Ehrler B..(2017).Indirect to direct bandgap transition in methylammonium lead halide perovskite.Energy & Environmental Science,10(2).
MLA Wang T.,et al."Indirect to direct bandgap transition in methylammonium lead halide perovskite".Energy & Environmental Science 10.2(2017).
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