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题名: Decoupling Interfacial Charge Transfer from Bulk Diffusion Unravels Its Intrinsic Role for Efficient Charge Extraction in Perovskite Solar Cells
作者: Leng, Jing1, 2;  Liu, Junxue1, 2, 3;  Zhang, Jun3;  Jin, Shengye1, 2
刊名: JOURNAL OF PHYSICAL CHEMISTRY LETTERS
发表日期: 2016-12-15
DOI: 10.1021/acs.jpclett.6b02309
卷: 7, 期:24, 页:5056-5061
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science ;  Physics
英文摘要: In a perovskite solar cell, the overall photoinduced charge-transfer (CT) process comprises both charge diffusion through the bulk to perovskite/electrode interfaces and interfacial electron and hole transfer to electrodes. In this study, we decoupled these two entangled processes by investigating the film thickness-dependent CT dynamics from CH3NH3PbI3 perovskites to [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) (electron acceptor) and spiro-OMeTAD (hole acceptor). By fitting ultrafast transient absorption kinetics to an explicit "diffusion-coupled charge-transfer" model, we found that the charge diffusion from the film interior to perovskite/electrode interfaces took similar to 200 ps to a few nanoseconds, depending on the thickness of perovskite film; the subsequent interfacial charge transfer was ultrafast, similar to 6 ps for electron transfer to PCBM and similar to 8ps for hole transfer to Spiro-OMeTAD, and led to efficient charge extraction (>90%) to electrodes in a 400 nm thick film. Our results indicate that the picosecond interfacial charge transfer is a key to high-performance perovskite solar cells.
关键词[WOS]: LEAD IODIDE PEROVSKITE ;  ORGANOMETAL HALIDE PEROVSKITES ;  SPIRO-OMETAD ;  RECOMBINATION DYNAMICS ;  NANOCRYSTALLINE TIO2 ;  CARRIER DIFFUSION ;  SINGLE-CRYSTALS ;  QUANTUM DOTS ;  ELECTRON ;  CH3NH3PBI3
语种: 英语
WOS记录号: WOS:000390087000016
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/151820
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, Collaborat Innovat Ctr Chem Energy Mat IChEM, Dalian 116023, Peoples R China
3.China Univ Petr, Coll Chem Engn, State Key Lab Heavy Oil Proc, 66 Changjiang West Rd, Qingdao 266580, Peoples R China

Recommended Citation:
Leng, Jing,Liu, Junxue,Zhang, Jun,et al. Decoupling Interfacial Charge Transfer from Bulk Diffusion Unravels Its Intrinsic Role for Efficient Charge Extraction in Perovskite Solar Cells[J]. JOURNAL OF PHYSICAL CHEMISTRY LETTERS,2016,7(24):5056-5061.
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