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Reductive ionic liquid-mediated crystallization for enhanced photovoltaic performance of Sn-based perovskite solar cells

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Science China Chemistry 2022年第10期65卷 1895-1902页

作者： He Dong Chenxin Ran Wangyue Li Xin Liu Weiyin Gao yingdong xia Yonghua Chen Wei Huang Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211816China Key Laboratory for Organic Electronics&Information Displays(KLOEID) and Institute of Advanced Materials(IAM)Nanjing University of Posts and TelecommunicationsNanjing 210023China

Tin(Sn)-based perovskite solar cells(PSCs)have recently made inspiring progress,and certified power conversion efficiency(PCE)has reached impressive value of 14.8%.However,it is still challenging to realize efficient and stable 3D Sn-based PSCs due to the fast crystallization and easy Sn^(2+)oxidation of Sn-based perovskite.Herein,we reported the utilization of a reductive ionic liquid,methylamine formate(MAFa),to drive the controlled crystallization process and suppress Sn^(2+)oxidation of FASnI_(3)perovskite film.The coordination of C=O and Sn^(2+)and the hydrogen bonding of N-H···I between the MAFa and FASnI_(3)precursors are shown to be responsible for retarding the crystallization of FASnI_(3)during film-forming process,which promotes the oriented growth and reduced defect traps of the film.Moreover,the strong reducibility of–CHO groups in Fa−suppresses the oxidation of Sn^(2+)in the film.As a result,MAFa-modified 3D PSCs device could reach champion PCE of up to 8.50%,which is enhanced by 26.11%compared to the control device with PCE of 6.74%.Most importantly,the MAFa-modified device shows much improved stability compared to the control device under same conditions without encapsulation.This work adds key building blocks for further boosting the PCE and stability of Sn-based PSCs.

关键词： 3D Sn-based perovskite solar cells ionic liquid retarded crystallization suppressed Sn^(2+)oxidation

Stabilizing wide-bandgap halide perovskites through hydrogen bonding

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Science China Chemistry 2022年第8期65卷 1650-1660页

作者： Lei Tao xiaoqin Du Jianfei Hu Shixuan Wang Chen Lin Qi Wei yingdong xia Guichuan Xing Yonghua Chen Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(Nanjing Tech)Nanjing 211816China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of MacaoMacao SAR 999078China

Wide-bandgap(WBG)perovskites have emerged as promising materials for the construction of perovskite/silicon tandem solar cells.However,poor long-term operational stability due to the notorious photo-induced halide segregation is commonly observed.Here,we report the synthesis of stable~1.73 eV MA-based mixed I/Br WBG perovskites by ionic liquid solvent,methylammonium acetate(MAAc).The special internal hydrogen bond(N–H…I and N–H…Br)environment in the ionic liquid MAAc solvent over traditional N,N-dimethylformamide/dimethyl sulfoxide solvent stabilizes the diffusion of halide ions.This allows the suppression of the halide segregation in the mixed I/Br WBG perovskite film,which is previously suggested to be difficult.The hydrogen bonds also enable excellent decoupling of the crystal nucleation and growth process.Finally,a champion device efficiency of 20.59%is achieved,which is one of the highest reports,with improved ambient air,heat,and light stability.

关键词： wide-bandgap perovskite hydrogen bonds perovskite solar cells ionic liquid

Stability of Sn-Pb mixed organic–inorganic halide perovskite solar cells:Progress,challenges,and perspectives

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Journal of Energy Chemistry 2022年第2期31卷 371-404页

作者： Shaoshen Lv Weiyin Gao Yanghua Liu He Dong Nan Sun Tingting Niu yingdong xia Zhongbin Wu Lin Song Chenxin Ran Li Fu Yonghua Chen Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringXi’an 710072ShaanxiChina Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211816JiangsuChina School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina

The exploration of low bandgap perovskite material to approach Shockley-Queisser limit of photovoltaic device is of great significance,but it is still challenging.During the past few years,tin–lead(Sn-Pb)mixed perovskites with low bandgaps have been rapidly developed,and their single junction solar cells have reached power conversion efficiency(PCE)over 21%,which also makes them ideal candidate as low bandgap sub-cell for tandem device.Nevertheless,due to the incorporation of unstable Sn^(2+),the stability issue becomes the vital problem for the further development of Sn-Pb mixed perovskite solar cells(PSCs).In this review,we are dedicated to give a full view in current understanding on the stability issue of SnPb mixed perovskites and their PSCs.We begin with the demonstration on the origin of instability of Sn-Pb mixed perovskites,including oxidation of Sn^(2+),defects,and interfacial layer induced instability.Sequentially,the up-to-date developments on the stability improvement of Sn-Pb mixed perovskites and their PSCs is systematically reviewed,including composition engineering,additive engineering,and interfacial engineering.At last,the current challenges and future perspectives on the stability study of Sn-Pb mixed PSCs are discussed,which we hope could promote the further application of Sn-Pb mixed perovskites towards commercialization.

关键词： Sn-Pb mixed perovskites Stability Interfacial defects Energy level mismatch Solar cells

Recent progress on low dimensional perovskite solar cells

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Journal of Energy Chemistry 2018年第4期27卷 1091-1100页

作者： Lingfeng Chao Ze Wang yingdong xia Yonghua Chen Wei Huang Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing Teeh University(NanjingTech)Nanjing 211816Jiangsu.China Shaanxi Institute of Flexible Electronics(SIFE).Northwestern Polytechnical University(NPU) Xi'an 710072ShaanxiChina Key Laboratory for Organic Electronics&Information Displays(KLOEID) and Institute of Advanced Materials(IAM).Nanjing University of Posts and TelecommunicationsNanjing 210023JiangsuChina

Low dimensional perovskites have recently attracted much attention due to their vertical growth of crys- talline orientation, excellent film morphology, and long-term humidity, light, and heat stability, How- ever, low dimensional perovskites suffer fl＇om low power conversion efficiency （PCE） with respect to their three dimensional analogues. Therefore, it is imperative to find excellent low-dimensional perovskite materials for improving the PCE. Previous work has demonstrated that bulkier organic molecules, e,g., C6Hs（CH2）2NH3＋（PEA＋）, CH3（CH2）3NH3＋（n-BAT, iso-BA＋）, C2H4NH3 ＋, and polyethylenimine cations （PEI＋）, play an important role in the formation of low-dimensional perovskites. In this review, we review the recent development of low dimensional perovskites for solar cells application in terms of film preparation, photophysics, and stability of perovskites, as well as the related device structure and physics. We have also discussed the future development of low-dimensional perovskites from materials design, fabri- cation processes, and device structure.

关键词： Low dimensional perovskites Perovskite solar cells Stability Bulkier organic molecules

Chiral cation promoted interfacial charge extraction for efficient tin-based perovskite solar cells

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Journal of Energy Chemistry 2022年第5期31卷 789-796页

作者： Weiyin Gao He Dong Nan Sun Lingfeng Chao Wei Hui Qi Wei Hai Li yingdong xia Xingyu Gao Guichuan Xing Zhongbin Wu Lin Song Peter Müller-Buschbaum Chenxin Ran Yonghua Chen Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing 211816JiangsuChina Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoChina Shanghai Synchrotron Radiation Facility(SSRF) Zhangjiang LaboratoryShanghai Advanced Research InstituteChinese Academy of SciencesShanghaiChina Lehrstuhl für Funktionelle Materialien Physik DepartmentTechnische Universität München.James-Franck-Str.185748 GarchingGermany Heinz Maier-Leibnitz Zentrum(MLZ) Technische Universität MünchenLichtenbergstr.185748 GarchingGermany

Pb-free Sn-based perovskite solar cells(PSCs) have recently made inspiring progress, and power conversion efficiency(PCE) of 14.8% has been achieved. However, due to the energy-level mismatch and poor interfacial contact between commonly used hole transport layer(i.e., poly(3,4-ethylenedioxythio phene):poly(styrene sulfonate), PEDOT:PSS) and FASnI_(3) film, it is still challenging to effectively extract holes at the interface. Owing to the p-type nature of Sn-based perovskites, the efficient hole extraction is of particular significance to improve the PCE of their solar cells. In this work, for the first time, the role of chiral cations, a-methylbenzylamine(S-/R-/rac-MBA), in promoting hole transportation of FASnI_(3)-based PSCs is demonstrated. The introduction of MBAs is found to form 2D/3D film with lowdimensional structures locating at PEDOT:PSS/FASnI_(3) interface, which facilitates the energy level alignment and efficient charge transfer at the interface. Importantly, chiral-induced spin selectivity(CISS)effect of R-MBA_(2)SnI_(4)induced by chiral R-MBA cation is found to further assist the specific interfacial transport of accumulated holes. As a result, R-MBA-based PSCs achieve decent PCE of 10.73% with much suppressed hysteresis and enhanced device stability. This work opens up a new strategy to efficiently promote the interfacial extraction of accumulated charges in working PSCs.

关键词： Tin perovskite Chiral cation 2D/3D structure Interfacial charge extraction Solar cells

Stable Metal–Halide Perovskite Colloids in Protic Ionic Liquid

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CCS Chemistry 2022年第10期4卷 3264-3274页

作者： Hao Gu Tingting Niu Shouwei Zuo Yongqing Cai Lingfeng Chao Peter Müller-Buschbaum yingdong xia Jing Zhang Guichuan Xing Yonghua Chen Key Laboratory of Flexible Electronics(KLOFE) Institution of Advanced Materials(IAM)Nanjing Tech University(NanjingTech)Nanjing 211816Jiangsu Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoTaipa 999078Macao Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi’an 710072 Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049 University of Chinese Academy of Sciences Beijing 100049 Lehrstuhl für Funktionelle Materialien Physik DepartmentTechnische Universität MünchenGarching 85748 Heinz Maier-Leibnitz Zentrum(MLZ) Technische Universität MünchenGarching 85748

Obtaining long-term stable and robust perovskite colloids solution remains an important scientific challenge due to the limited interaction between solvent and perovskite solutes.Here,we unveil the formation mechanism of chemically robust perovskite precursor solutions under ambient conditions using methylammonium acetate(CH3NH3•CH3COO,MAAc)protic ionic liquid(PIL)solvent.Tens of nanometers colloids are assembled on the molecular level via regular oriented gel-like lamellae with a mean thickness of 34.69 nm,width of 56.81 nm,and distance of 91.05 nm.

关键词： perovskite colloids protic ionic liquid X-ray absorption fine structure spectroscopy coordination interaction

Ionic Liquid for Perovskite Solar Cells:An Emerging Solvent Engineering Technology

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Accounts of Materials Research 2021年第11期2卷 1059-1070页

作者： Lingfeng Chao Tingting Niu yingdong xia Yonghua Chen Wei Huang Frontiers Science Center for Flexible Electronics(FSCFE) Institute of Flexible Electronics(IFE)Northwestern Polytechnical University(NPU)Xi’an 710072China Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(Nanjing Tech)Nanjing 211816 JiangsuChina

CONSPECTUS:Perovskite solar cells(PSCs)have,in recent years,become one of the most in-depth photovoltaic materials in many different disciplines due to their long-range charge carrier diffusion lengths,strong light absorption,easy tuning of the band gaps,low defect density,and solution processability.The power conversion efficiency(PCE)of single-junction PSCs has reached a certified value of 25.5%,which has caught up with or even surpassed traditional photovoltaic technologies,such as silicon(Si)solar cells,thin film solar cell,etc.In addition to the performance of PSCs comparable to traditional photovoltaic technology,its biggest feature is that it can be prepared by a solution method.The preparation process of the solution method simplify the film preparation process and greatly reduce the preparation cost.In addition,the solution method provides a favorable option for the energy supply of flexible wearable devices in the future.

关键词： Solar film preparation

Efficient and stable Ruddlesden-Popper layered tin-based perovskite solar cells enabled by ionic liquid-bulky spacers

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Science China Chemistry 2021年第9期64卷 1577-1585页

作者： Jian Qiu Yuexin Lin Xueqin Ran Qi Wei Xingyu Gao yingdong xia Peter Müller-Buschbaum Yonghua Chen Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(NanjingTech)Nanjing211816China Frontiers Science Center for Flexible Electronics Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&EngineeringNorthwestern Polytechnical UniversityXi’an710072China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai201204China Lehrstuhl für Funktionelle Materialien Physik DepartmentTechnische Universität München85748GarchingGermany Heinz Maier-Leibnitz Zentrum(MLZ) Technische Universität München85748GarchingGermany

The crucial component,bulky spacers,in two-dimensional Ruddlesden-Popper(2 DRP)layered tin(Sn)perovskites are highly limited by halide ammonium salts,leading to the insufficient control of complex crystallization process due to the limited interaction between bulky spacers and 2 DRP perovskite frameworks.Here,we report an ionic liquid-bulky spacer,butylammounium acetate(BAAc O),for constructing efficient and stable 2 DRP Sn-based perovskite solar cells(PSCs).In contrast to the traditional halide ammonium bulky spacer,butylammounium iodide(BAI),the Ac O^(-)-functional group in BAAc O has a strong interaction with formamidine ions(FA^(+))and Sn2+.The inter-component interaction allows the formation of controllable intermediates for the favorable growth of smooth,dense,and highly oriented perovskite films.A PSC with power conversion efficiency of 10.36%(7.16%for BAI)is achieved,which is the highest report,along with improved stability with~90%retained after~600 h storage in N_(2) atmosphere without any encapsulation.

关键词： lead-free Ruddlesden-Popper phase Sn-based perovskite solar cells ionic liquid-bulky spacer crystallization kinetic control

Solution processed nano-ZnMgO interfacial layer for highly efficient inverted perovskite solar cells

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Journal of Energy Chemistry 2019年第1期28卷 107-110页

作者： Ze Wang yingdong xia Lingfeng Chao Yufeng Pan Meijin Li Renzhi Li Bin Du Yonghua Chen Wei Huang Key Laboratory of Flexible Electronics (KLOFE) & Institution of Advanced Materials (IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) Nanjing Tech University (NJTECH) Shaanxi Institute of Flexible Electronics (SIFE) Northwestern Polytechnical University (NPU) Key Laboratory for Organic Electronics & Information Displays (KLOEID) and Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications

Interfacial layer has a significant impact on the achievement of highly efficient organic–inorganic hybrid perovskite solar cells(PSCs). Here, we introduced a nano-ZnMgO(magnesium doped ZnO, abbreviated as ZnMgO) as interfacial layer between [6, 6]-Phenyl C_(61) butyric acid methyl ester(PC_(61) BM) layer and Al electrode to replace LiF or ZnO interlayer and enhance device performance. The device efficiency has been improved from 11.43% to 15.61% and the hysteresis was decreased dramatically. Such huge enhancement of power convert efficiency(PCE) can be attributed to the low dark current density, enhancement of electron-selective contact, and low energy barrier at the PC_(61) BM/Al interface. We suggest that this simple nano-scale interlayer can provide an efficient charge transport and extraction for highly efficient PSCs.

关键词： Nano-ZnMgO Interfacial layer High efficiency Perovskite solar cells