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Decisive Role of Elevated Mobility in X55 and X60 Hole Transport Layers for High-Performance Perovskite Solar Cells
Su, Zhenhuang1,2,3; Hui, Wei4,5; Dong, Yanan1; Wang, Chenyue1; Hu, Jinping1,3; Shen, Kongchao1; Wen, Wen1; Xiong, Yimin6; Cao, Liang6; Chen, Yonghua4,5; Gao, Xingyu1,7
2021-08-23
Source PublicationACS APPLIED ENERGY MATERIALS
ISSN2574-0962
Corresponding AuthorCao, Liang(lcao@hmfl.ac.cn) ; Chen, Yonghua(iamyhchen@njtech.edu.cn) ; Gao, Xingyu(gaoxingyu@sinap.ac.cn)
AbstractBoth the transport properties in the hole transport layer (HTL) and the interfacial energetics between the HTL and perovskite in perovskite solar cells (PSCs) play crucial roles in determining the PSC performance. To prioritize their roles for the rational design of PSCs, the transport properties and interfacial energetics of two spiro[fluorene-9,9'-xanthene]-based small-molecule species termed X55 and X60 molecules on the perovskite after different doping treatments along with the performance of the corresponding PSCs were systematically investigated. Although the interfacial energetics of both molecules deposited on the CH3NH3PbI3 perovskite were determined to be favorable for hole transfer/injection by the in situ photoemission study, the PSCs with these molecular HTLs are extremely inferior due to their poor HTL conductivity/mobility. While the interfacial energetics after LiTFSI/tBP doping either barely change in X60 or even become more favorable in X55, the hole mobility in both films only improves slightly, leading to the best power conversion efficiency (PCE) of only 4-6% for their corresponding PSCs. Even though the doping effect triggered by subsequent air exposure leads to an unwanted increase of the hole injection barrier, the hole mobility in these films increases by about 1 order of magnitude, which dramatically promotes the corresponding PSC performance with champion PCEs of 19.89% for X55-based PSCs and 19.15% for X60-based PSCs, respectively. Thus, it is the significantly elevated HTL hole mobility that decisively promotes the corresponding PSC performance dramatically, which implies that the high carrier mobility in the transport layers often could be more vital over interfacial energetics for high-performance PSCs.
Keywordcharge transport properties doping effect photoemission spectroscopy band bending effect interfacial electronic structures energy level alignment photovoltaic application
DOI10.1021/acsaem.1c01022
WOS KeywordENERGY-LEVEL SHIFTS ; SPIRO-MEOTAD ; ORGANIC SEMICONDUCTORS ; IODINE MIGRATION ; LOW-COST ; EFFICIENT ; CRYSTALLIZATION ; HYSTERESIS ; IMPACT ; FILMS
Indexed BySCI
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFB0701900] ; National Key Research and Development Program of China[2017YFA0403400] ; National Key Research and Development Program of China[2017YFA0402900] ; National Natural Science Foundation of China[11675252] ; National Natural Science Foundation of China[U1632265] ; National Natural Science Foundation of China[12074385] ; High Magnetic Field Laboratory of Anhui Province
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China ; High Magnetic Field Laboratory of Anhui Province
WOS Research AreaChemistry ; Energy & Fuels ; Materials Science
WOS SubjectChemistry, Physical ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000688250200029
PublisherAMER CHEMICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.hfcas.ac.cn:8080/handle/334002/125276
Collection中国科学院合肥物质科学研究院
Corresponding AuthorCao, Liang; Chen, Yonghua; Gao, Xingyu
Affiliation1.Chinese Acad Sci, Shanghai Adv Res Inst, Zhangjiang Lab, Shanghai Synchrotron Radiat Facil SSRF, Shanghai 201204, Peoples R China
2.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Nanjing Tech Univ Nanjing Tech, Key Lab Flexible Elect KLOFE, Nanjing 211816, Jiangsu, Peoples R China
5.Nanjing Tech Univ Nanjing Tech, Inst Adv Mat IAM, Nanjing 211816, Jiangsu, Peoples R China
6.Chinese Acad Sci, Anhui Key Lab Condensed Matter Phys Extreme Condi, High Magnet Field Lab, HFIPS, Hefei 230031, Anhui, Peoples R China
7.Chinese Acad Sci, Key Lab Interfacial Phys & Technol, Shanghai 201800, Peoples R China
Recommended Citation
GB/T 7714
Su, Zhenhuang,Hui, Wei,Dong, Yanan,et al. Decisive Role of Elevated Mobility in X55 and X60 Hole Transport Layers for High-Performance Perovskite Solar Cells[J]. ACS APPLIED ENERGY MATERIALS,2021,4.
APA Su, Zhenhuang.,Hui, Wei.,Dong, Yanan.,Wang, Chenyue.,Hu, Jinping.,...&Gao, Xingyu.(2021).Decisive Role of Elevated Mobility in X55 and X60 Hole Transport Layers for High-Performance Perovskite Solar Cells.ACS APPLIED ENERGY MATERIALS,4.
MLA Su, Zhenhuang,et al."Decisive Role of Elevated Mobility in X55 and X60 Hole Transport Layers for High-Performance Perovskite Solar Cells".ACS APPLIED ENERGY MATERIALS 4(2021).
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