Reconfiguring the band-edge states of photovoltaic perovskites by conjugated organic cations

doi:10.1126/science.abd4860

GSTDTAP > 气候变化

DOI	10.1126/science.abd4860
	Reconfiguring the band-edge states of photovoltaic perovskites by conjugated organic cations
	Jingjing Xue; Rui Wang; Xihan Chen; Canglang Yao; Xiaoyun Jin; Kai-Li Wang; Wenchao Huang; Tianyi Huang; Yepin Zhao; Yaxin Zhai; Dong Meng; Shaun Tan; Ruzhang Liu; Zhao-Kui Wang; Chenhui Zhu; Kai Zhu; Matthew C. Beard; Yanfa Yan; Yang Yang
	2021-02-05
发表期刊	Science
出版年	2021
英文摘要	The band edge of hybrid organic-inorganic perovskites, which have the general formula ABX3, is mainly controlled by the inorganic X anions (such as chloride) and the B cation (such as lead). Organic A-site cations usually only exert indirect structural effects because their electronic levels lie far from the band edge. Xue et al. show that cations with large π-conjugated structures can interact with inorganic frontier molecular orbitals. A surface layer of ethylammonium pyrene, which had an optimal intercalation distance, increased hole mobilities and power conversion efficiencies relative to a reference inorganic perovskite and also improved device stability. Science , this issue p. [636][1] The band edges of metal-halide perovskites with a general chemical structure of ABX3 (A, usually a monovalent organic cation; B, a divalent cation; and X, a halide anion) are constructed mainly of the orbitals from B and X sites. Hence, the structural and compositional varieties of the inorganic B–X framework are primarily responsible for regulating their electronic properties, whereas A-site cations are thought to only help stabilize the lattice and not to directly contribute to near-edge states. We report a π-conjugation–induced extension of electronic states of A-site cations that affects perovskite frontier orbitals. The π-conjugated pyrene-containing A-site cations electronically contribute to the surface band edges and influence the carrier dynamics, with a properly tailored intercalation distance between layers of the inorganic framework. The ethylammonium pyrene increased hole mobilities, improved power conversion efficiencies relative to that of a reference perovskite, and enhanced device stability. [1]: /lookup/doi/10.1126/science.abd4860
领域	气候变化 ; 资源环境
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文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/314056
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Jingjing Xue,Rui Wang,Xihan Chen,et al. Reconfiguring the band-edge states of photovoltaic perovskites by conjugated organic cations[J]. Science,2021.
APA	Jingjing Xue.,Rui Wang.,Xihan Chen.,Canglang Yao.,Xiaoyun Jin.,...&Yang Yang.(2021).Reconfiguring the band-edge states of photovoltaic perovskites by conjugated organic cations.Science.
MLA	Jingjing Xue,et al."Reconfiguring the band-edge states of photovoltaic perovskites by conjugated organic cations".Science (2021).