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Advances to Stabilize Photoactive Phase of FAPbI_(3)Perovskite

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Chinese Journal of Chemistry 2023年第20期41卷 2730-2745页

作者： Kailin Li huanping zhou Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationSchool of Materials Science and EngineeringPeking UniversityBeijing100871 China

Recently,hybrid organic-inorganic perovskite materials have drawn widespread attention because of their outstanding optoelectrical properties(i.e.,high absorption coefficient,long carrier diffusion distance),hence they are suitable light-absorbing materials for photovoltaic application.Among all perovskite materials,formamidinium lead iodide(FAPbI3)based solar cells exhibit impressive power conversion efficiency(PCE)at laboratory stage,showing great potential to compete with silicon-based solar cell.However,FAPbI3 still suffers from poor phase stability which is the prior problem that needs to be addressed before its further commercialization.To be precise,the photoactive phase(αphase)is thermodynamically metastable at room temperature,which not only makesαphase tend to transform into photoinactive phase(δphase),but also causes competitive crystallization between two phases during the film preparation process,making it hard to fabricate pureα-FAPbI3 films.In our review,we summarized key factors that are vital for obtaining high-quality FAPbI3 perovskite thin films and enhancing the stability of FAPbI3 photoactive phase.First of all,precursor solution stability is of great importance since the conditions of precursor solution determine the nucleation and crystal growth process of perovskite.By introducing coordinating additives,using FAPbI3 single crystal as raw material or applying co-solution strategy,the impurities formed by side reaction during precursor solution aging can be effectively suppressed,thus the stability of FAPbI3 solution can be greatly prolonged.Second,the crystallization kinetics of FAPbI3 have been systematically manipulated to obtain dense and large grain size perovskite films.Through introducing intermediate phase,regulating the surface energy,and retarding the crystal growth of FAPbI3 in crystallization process,not only films without pinholes and fewer grain boundaries can be obtained,the pre-formedδphase at room temperature can also be well-suppressed,thus high-qualityα-FAPbI3 films can be

关键词： FAPbI_(3)perovskite Stability Precursor Crystallization Thermodynamics

One-dimensional perovskite-based Li-ion battery anodes with high capacity and cycling stability

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Journal of Energy Chemistry 2022年第9期31卷 73-80,I0003页

作者： Hua Kong Jiafeng Wu Ying Han Yu Zhang Ning zhou Qi Chen Wentao Sun huanping zhou Lian-Mao Peng Key Laboratory for the Physics and Chemistry of Nanodevices School of ElectronicsPeking UniversityBeijing 100871China School of Materials Science and Engineering Peking UniversityBeijing 100871China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China

Perovskite,widely used in solar cells,has also been proven to be potential candidate for effective energy storage material.Recent progress indicates the promise of perovskite for battery applications,however,the specific capacity of the resulting lithium-ion batteries must be further increased.Here,by adjusting the dimensionality of perovskite,we fabricated high-performing one-dimensional hybrid perovskite C_(4)H_(20)N_(4)PbBr_(6) based lithium-ion batteries,with the first specific capacity as high as 1632.8 mAh g^(-1)and a stable specific capacity of 598.0 mAh g^(-1)after 50 cycles under the condition of the constant current density of 150 mA g^(-1).The stable specific capacity is 2.36 times higher than that of the three-dimensional perovskite CH_(3)NH_(3)PbBr_(3)(253.2 mAh g^(-1)),and 1.6 times higher than that of the commercialized graphite electrode(372 mAh g^(-1)).The structure difference and the associated ion diffusivity are revealed to substantially affect the specific capacity of the perovskite-based lithium-ion battery.Our study opens up new directions for the applications of hybrid perovskites in energy storage devices.

关键词： Li-ion battery One-dimensional perovskite materials

Electrodeposition of Zn(O,S)(zinc oxysulfide)thin films:Exploiting its thermodynamic and kinetic processes with incorporation of tartaric acid

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Journal of Energy Chemistry 2018年第3期27卷 913-922页

作者： Qiao Cheng Dong Wang huanping zhou Department of Energy and Resources Engineerirzg College of EngineeringPeking UniversityBeUing 100871China

Zn（O,S）（zinc oxysulfide） is an important chalcogenide material recently reported to be potentially applied as electrode buffers in thin film solar cells. Both vacuum and solution approaches have enabled the fabrication of Zn（O,S） films. However they either require extreme conditions and high energy consumption for synthesis, or suffer from lack of controllability mainly due to the thermodynamic and kinetic distinction between Zn O and Zn S during film growth. Here we demonstrated an effective electrodeposition route to obtain high-quality Zn（O,S） thin films in a controllable manner. Importantly, tartaric acid was employed as a secondary complexing agent in the electrolyte to improve the film morphology, as well as to adjust other key properties such as composition and absorption. To elucidate the vital role that tartaric acid played, thermodynamic and kinetic processes of electrodeposition was investigated and discussed in detail. The accumulative contribution has shed light on further exploit of Zn（O,S） with tunable properties and optimization of the corresponding electrodeposition process, for the application in thin film solar cells.

关键词： Zinc oxysulfide Zn（O,S） Electrodeposition Tartaric acid

Ion migration in halide perovskite solar cells:Mechanism,characterization,impact and suppression

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Journal of Energy Chemistry 2021年第12期30卷 528-549,I0013页

作者： Huachao Zai Yue Ma Qi Chen huanping zhou Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationBIC-ESATSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications Experimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Metal halide perovskites are emerging as the most promising candidate for the next-generation Photovoltaics(PV)materials,due to their superior optoelectronic properties and low cost.However,the resulting Perovskite solar cells(PSCs)suffer from poor stability.In particular,the temperature and light activated ionic defects within the perovskite lattice,as well as electric-field-induced migration of ionic defects,make the PSCs unstable at operating condition,even with device encapsulation.There is no doubt that the investigation of ion migration is crucial for the development of PSCs with high intrinsic stability.In this review,we first briefly introduce the origin and pathways of ion migration,and also the essential characterization methods to identify ion migration.Next,we discuss the impact of ion migration on the perovskite films and cells with respect to photoelectric properties and stability.Then,several representative strategies to suppress ion migration are systematically summarized in the context of composition engineering,additive engineering and interface engineering,with an in-depth understanding on the underlying mechanisms which may provide more clues for further fabrication of PSCs with improved stability.Finally,a perspective with some suggestion on future research directions and chemical approaches are provided to alleviate ion migration in perovskite materials and the entire devices.

关键词： Ion migration Perovskite Solar cell Defect Stability

Impeded degradation of perovskite solar cells via the dual interfacial modification of siloxane

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Science China Chemistry 2022年第11期65卷 2299-2306页

作者： Xiao Zhang Changsu Cao Yang Bai Cheng Zhu Huachao Zai Sai Ma Yihua Chen Zhenhua Cui Congbo Shi Chenyue Wang Chenxiao zhou Guizhou Yuan Ziyan Gao Jiawang Hong Jie Dou Hao Wang huanping zhou Hai Xiao Jun Li Qi Chen Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing100081China Experimental Center of Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Department of Chemistry and Key Laboratory of Organic Optoelectronics and Molecular Engineering of Ministry of Education Tsinghua UniversityBeijing 100084China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China Shanghai Synchrotron Radiation Facility(SSRF) Zhangjiang LabShanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China School of Aerospace Engineering Beijing Institute of TechnologyBeijing 100081China

It is challenging to improve the long-term stability of perovskite solar cells(PSCs) without sacrificing efficiency. The perovskite absorbers degrade from the film surface/interfaces, which follows entangled mechanisms that have not been fully revealed yet.Herein, we decouple and elaborate two distinctive pathways regarding film degradation based on FACsPbI3perovskites.Moreover, a dual interfacial modification strategy has been developed for improving the material’s intrinsic stability, thus leading to the film degrading in a more retardant pathway. The corresponding PSCs achieve a stable power output efficiency of 23.75%.More importantly, the unencapsulated PSCs devices retain over 93% of their initial PCE after the maximum power point(MPP)tracking under the continuous 1-sun illumination and show significantly improved stability after aged under the thermal treatment or stored in ambient atmosphere for over 1500 hours without obvious PCE decay. This work shows the importance of modulating the degradation pathway on stability improvement, and at the same time, proposes a strategy for designing perovskite-based optoelectronics with excellent performance and stability.

关键词： perovskite solar cells stability degradation kinetics

Improved interfacial adhesion for stable flexible inverted perovskite solar cells

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Journal of Energy Chemistry 2023年第1期76卷 288-294,I0008页

作者： Jie Dou Qizhen Song Yue Ma Hao Wang Guizhou Yuan Xueyuan Wei Xiuxiu Niu Sai Ma Xiaoyan Yang Jing Dou Shaocheng Liu huanping zhou Cheng Zhu Yihua Chen Yujing Li Yang Bai Qi Chen Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications MIIT Key Laboratory for Low-dimensional Quantum Structure and DevicesExperimental Center of Advanced MaterialsSchool of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China School of Materials Science and Engineering Peking UniversityBeijing 100871China

Flexible perovskite solar cells have attracted widespread attention due to their unique advantages in lightweight,high flexibility,and easy deformation,which are suitable for portable electronics.However,the inverted(p-i-n)structured devices suffer from poor stability largely due to the low adhesion at the brittle interface(the hole transport layer/perovskite).Herein,zeolitic imidazolate framework-67(ZIF-67)is applied to inverted structured cells to optimize the interface and prolong the device lifetime.As a result,the flexible devices based on ZIF-67 obtain the champion power conversion efficiency of 20.16%.Over 1000 h under continuous light irradiation,the device retains 96%and 80%of its original efficiency without and with bias,respectively.Notably,devices show mechanical endurance with over 78%efficiency retention after 10,000 cycles of consecutive bending cycles(R=6 mm).The introduction of ZIF-67 suppresses the cracking in device bending,which results in improved environmental stability and bending durability.

关键词： ZIF-67 Flexible perovskite solar cells Interfacial adhesion Stability

Silver nanowires with semiconducting ligands for low- temperature transparent conductors

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Nano Research 2016年第2期9卷 392-400页

作者： Brion Bob Ariella Machness Tze-Bin Song huanping zhou Choong-Heui Chung Yang Yang Department of Materials Science and Engineering and California NanoSystems Institute University of California Los Angeles LosAngeles CA 90025 USA Department of Materials Science and Engineering Hanbat National University Daejeon 305-719 Republic of Korea

金属 nanowire 网络在很低的免职温度与高传播和低表抵抗价值为透明电极的快速的制造代表一个有希望的候选人。在传导性的 nanowire 电极的形成的通常遇到的挑战正在建立在 nanowires 之间的高质量的电子接触通过网络便于远程的当前的... 详细信息

金属 nanowire 网络在很低的免职温度与高传播和低表抵抗价值为透明电极的快速的制造代表一个有希望的候选人。在传导性的 nanowire 电极的形成的通常遇到的挑战正在建立在 nanowires 之间的高质量的电子接触通过网络便于远程的当前的运输。与一个半导体的大音阶的第五音胶化锡氧化物矩阵包含 nanowire ligand 移动和代替的一个新系统与对免职以后的处理的最小的需要在戏剧性地减少的温度启用了高效的透明电极的制造。

关键词：银纳米线半导体低温度配体快速制造透明电极沉积温度电流传输

The investigation of an amidine-based additive in the perovskite films and solar cells

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Journal of Semiconductors 2017年第1期38卷 48-53页

作者： Guanhaojie Zheng Liang Li Ligang Wang Xingyu Gao huanping zhou Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201204China Department of Materials Science and Engineering College of EngineeringPeking UniversityBeijing 100871China

Here,we introduced acetamidine（C2H3N2H3,Aa）-based salt as an additive in the fabrication of perovskite（CH3NH3PW3）layer for perovskite solar cells.It was found that as an amidine-based salt,this additive successfully enhanced the crystallinity of CH3NH3PW3 and helped to form smooth and uniform films with comparable grain size and full coverage.Besides,perovskite film with additive showed a much longer carrier lifetime and an obviously enhanced open-circuit voltage in the corresponding devices,indicating that the acetamidine-based salt can reduce the carrier recombination in both the film and device.We further demonstrate a promising perovskite device based on acetamidine salt by using a configuration of ITOATiO2/Perovskite/Spiro-OMeTAD/Au under 〈 150 ℃ fabrication condition.A power conversion efficiency（PCE）of 16.54%was achieved,which is much higher than the control device without acetamidine salt.These results present a simple method for film quality optimization of perovskite to further improve photovoltaic performances of perovskite solar cells,which may also benefit the exploration of A cation in perovskite materials.

关键词： acetamidine crystallinity open-circuit voltage perovskite solar cell

Balancing Energy-Level Difference for Efficient n-i-p Perovskite Solar Cells with Cu Electrode

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Energy Material Advances 2022年第1期2022卷 157-164页

作者： Ziqi Xu Nengxu Li Xiuxiu Niu Huifen Liu Guilin Liu Qi Chen huanping zhou Beijing Key Laboratory for Theory and Technology of Advanced Battery Materials Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationBIC-ESATSchool of Materials Science and EngineeringPeking UniversityBeijing 100871China China Automotive Technology and Research Center Co. Ltd.TianjinChina Experimental Centre for Advanced Materials School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China School of Science Jiangnan UniversityWuxiJiangsu 214122China

Developing low cost and stable metal electrode is crucial for mass production of perovskite solar cells(PSCs).As an earthabundant element,Cu becomes an alternative candidate to replace noble metal electrodes such as Au and Ag,due to its comparable physiochemical properties with simultaneously good stability and low cost.However,the undesirable band alignment associated with the device architecture impedes the exploration of efficient Cu-based n-i-p PSCs.Here,we demonstrated the ability of tuning the Fermi level(E_(F))of hole transport layer(HTL)to reduce the energy level difference(Schottky barrier)between HTLs and Cu.Further,we identified that the balance of energy level difference between HTL and adjacent layers(including perovskite and Cu)is crucial to efficient carrier transportation and photovoltaic performance improvement in the PSCs.Under the optimized condition,we achieve a device power conversion efficiency(PCE)of 20.10%,which is the highest on the planar n-i-p PSCs with Cu electrode.Meanwhile,the Cu-based PSCs can maintain 92%of their initial efficiency after 1000 h storage,which is comparable with Au-based devices.The present work not only extends the understanding on the band alignment of neighboring semiconductor functional layer in the device architecture to improve the resulting performance but also suggests great potential of Cu electrode for application in PSCs community.

关键词： perovskite alignment electrode