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Organic salt mediated growth of phase pure and stable all-inorganic CsPbX3（X = I, Br） perovskites for efficient photovoltaics

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Science Bulletin 2019年第23期64卷 1773-1779页

作者： taiyang zhang Yong Wang Xingtao Wang Min Wu Wenhua Liu Yixin Zhao School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China School of Environment and Energy South China University of TechnologyGuangzhou 510006China

All-inorganic CsPbX3(X = I, Br) perovskites without organic component are promising for long-term stability but face main challenges of facile fabrication and phase stability. Here we discover a general organic methylamine acetate salt mediated growth method to deposit high quality phase pure and stable CsPbX3(X = I, Br) perovskite films via a novel precursor consisting of stoichiometric cesium acetate(CsAc),methylamine halide(MAX) and lead halide(PbX2). Interestingly, these organic salts of CsAc and MAX could efficiently promote the crystallization process especially lower the crystallization temperature,but do not introduce the incorporation of organic MA cation into all-inorganic CsPbX3 *** phase pure and stable CsPbX3 perovskites with tunable band gaps can be fabricated into high efficiency photovoltaics. Our organic salt mediated growth of all-inorganic perovskite not only reveals the all-inorganic CsPbX3 perovskite’s unique crystal growth mechanism but also demonstrates their promising application for photovoltaics.

关键词： All-inorganic perovskite CsPbX3 Low temperature Methylamine acetate Solar cells

Spontaneous low-temperature crystallization of α-FAPbI3 for highly efficient perovskite solar cells

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Science Bulletin 2019年第21期64卷 1608-1616页

作者： taiyang zhang Qiaoling Xu Feng Xu Yuhao Fu Yong Wang Yanfa Yan Lijun zhang Yixin Zhao School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Automobile Materials Ministry of EducationSchool of Materials Science and EngineeringJilin UniversityChangchun 130012China Department of Physics and Astronomy University of ToledoToledoOH 43606USA State Key Laboratory of Superhard Materials Jilin UniversityChangchun J30012China

Formamidinium lead triiodide(HC(NH2)2PbI3 or FAPbI3)is a promising light absorber for high-efficiency perovskite solar cells because of its superior light absorption range and thermal stability to CH3NH3PbI3(MAPbI3).Unfortunately,it is difficult to fabricate high-quality FAPbI3 thin films to surpass the MAPbI3-based cells due to easily forming unwanted but more stable yellow d-phase and thus requiring high annealing-temperature for wanted photovoltaic-active black ***,we reported a novel low-temperature fabrication of highly crystallized a-FAPbI3 film exhibiting uniaxial-oriented nature with large grain sizes up to 2 ***-principles energetic calculations predicted that this novel deposition should be ascribed to the formation of a high-energy metastable two-dimensional(2D)intermediate of MAFAPbI3 Cl followed by a spontaneous conversion to *** ions exchange reaction during this MAFAPbI3 Cl-FAPbI3 conversion account for the perovskite film uniaxial-oriented grown along the(111)*** large-grain and uniaxial-oriented grown a-FAPbI3 based solar cells exhibited an efficiency up to 20.4%accompanying with low density-voltage(J-V)hysteresis and high stability.

关键词： Perovskite solar cells Spontaneous crystallization FAPbI3 Two-dimensional (2D) perovskites

A mixed-cation lead iodide MA_(1-x)EA_xPbI_3 absorber for perovskite solar cells

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Journal of Energy Chemistry 2018年第1期27卷 215-218页

作者： Yong Wang taiyang zhang Ge Li Feng Xu Tian Wang Yihui Li Yang Yang Yixin Zhao School of Environmental Science and Engineering Shanghai Jiao Tong University Clean Energy Research Institute China Huaneng Group

The mixed-cation lead halide perovskites have emerged as a new class of promising light harvesting materials for solar cells. The formamidinium（FA）, methylammonium（MA） and Cs cations are widely studied in the field of mixed-cation perovskites. Here, we have investigated ethylammonium（EA） as an alternative cation to fabricate a mixed-cation perovskite of MA_（1-x）EA_xPbI_3. We have characterized the materials using the X-ray diffraction（XRD）, scanning electron microscope（SEM）, and UV–vis spectrum. Our results have confirmed the successful incorporation of EA cations into MAPbI_3. Interestingly, the optimal amount of EA to achieve the best performance is quite low. This is different from the FA–MA mixed-cation perovskites although EA and FA have similar radii. In short, the EA–MA mixed-cation perovskite has some material and device properties highly distinguishable from the FA–MA one.

关键词： Mixed cation Ethylammonium MA1-xEAxPbl3 Perovskite solar cell

Solution chemistry quasi-epitaxial growth of atomic CaTiO_(3)perovskite layers to stabilize and passivate TiO_(2)photoelectrodes for efficient water splitting

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Fundamental Research 2023年第6期3卷 918-925页

作者： Ning Wei Yuetian Chen Xingtao Wang Miao Kan taiyang zhang Yixin Zhao Frontiers Science Center for Transformative Molecules School of Environmental Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200240China

Perovskite oxides with unique crystal structures and high defect tolerance are promising as atomic surface passivation layers for photoelectrodes for efficient and stable water ***,controllably depositing and crystalizing perovskite-type metal oxides at the atomic level remains challenging,as they usually crystalize at higher temperatures than regular metal ***,we report a mild solution chemistry approach for the quasi-epitaxial growth of an atomic CaTiO_(3)perovskite layer on rutile TiO_(2)nanorod *** high-temperature crystallization of CaTiO_(3)perovskite is overcome by a sequential hydrothermal conversion of the atomic amorphous TiOx layer to CaTiO_(3)*** atomic quasi-epitaxial CaTiO_(3)layer passivated TiO_(2)nanorod arrays exhibit more efficient interface charge transfer and high photoelectrochemical performance for water *** a mild solution-based approach for the quasi-epitaxial growth of atomic metal oxide perovskite layers could be a promising strategy for both fabricating atomic perovskite layers and improving their photoelectrochemical properties.

关键词： Solution atomic layer deposition CaTiO_(3)/TiO_(2) Quasi-epitaxial growth In-situ surface passivation Photoelectrochemical water splitting

MA Cation-Induced Diffusional Growth of Low-Bandgap FA-Cs Perovskites Driven by Natural Gradient Annealing

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Research 2021年第1期2021卷 748-758页

作者： taiyang zhang Yuetian Chen Miao Kan Shumao Xu Yanfeng Miao Xingtao Wang Meng Ren Haoran Chen Xiaomin Liu Yixin Zhao School of Environmental Science and Engineering Shanghai Jiao Tong University800 Dongchuan Rd.Shanghai 200240China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200240China

Low-bandgap formamidinium-cesium(FA-Cs)perovskites of FA_(1-x)CsxPbI_(3)(x<0:1)are promising candidates for efficient and robust perovskite solar cells,but their black-phase crystallization is very sensitive to annealing ***,the low heat conductivity of the glass substrate builds up a temperature gradient within from bottom to top and makes the initial annealing temperature of the perovskite film lower than the black-phase crystallization point(~150℃).Herein,we take advantage of such temperature gradient for the diffusional growth of high-quality FA-Cs perovskites by introducing a thermally unstable MA^(+)cation,which would firstly formα-phase FA-MA-Cs mixed perovskites with low formation energy at the hot bottom of the perovskite films in the early annealing *** natural gradient annealing temperature and the thermally unstable MA^(+)cation then lead to the bottom-to-top diffusional growth of highly orientatedα-phase FA-Cs perovskite,which exhibits 10-fold of enhanced crystallinity and reduced trap density(~3:85×10^(15) cm^(−3)).Eventually,such FA-Cs perovskite films were fabricated into stable solar cell devices with champion efficiency up to 23.11%,among the highest efficiency of MA-free perovskite solar cells.

关键词： temperature annealing perovskite

A simple fabrication of CH3NH3PbI3 perovskite for solar cells using low-purity PbI2

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Journal of Semiconductors 2017年第1期38卷 66-70页

作者： Nanjie Guo taiyang zhang Ge Li Feng Xu Xufang Qian Yixin Zhao School of Environmental Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China

The CH3NH3PbI3（MAPbI3）perovskite was usually prepared by high-purity PbI2 with high *** low cost and low-purity PbI2 was seldom reported for fabrication of MAPW3 because it cannot even dissolve well in widely adopted solvent of *** developed an easy method to adapt low-purity PbI2 for fabrication of high quality MAPbI3 just by the simple addition of some hydrochloric acid into the mixture of low-purity PbI2,MAI and *** straightforward method can not only help dissolve the low quality PbI2 by reacting with some impurities in DMF,but also lead to a successful fabrication of high-quality perovskite solar cells with up to 14.80%efficiency comparable to the high quality PbI2 precursors.

关键词： perovskite material low-quality Pbl2 hydrochloric acid

In situ growth of ultra-thin perovskitoid layer to stabilize and passivate MAPbI_(3)for efficient and stable photovoltaics

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eScience 2021年第1期1卷 91-97页

作者： Yanfeng Miao Xingtao Wang Haijuan zhang taiyang zhang Ning Wei Xiaomin Liu Yuetian Chen Jie Chen Yixin Zhao School of Environmental Science and Engineering Frontiers Science Center for Transformative MoleculesShanghai Jiao Tong UniversityShanghai 200240China Center for Ultrafast Science and Technology Key Laboratory for Laser Plasmas(Ministry of Education)School of Physics and AstronomyCollaborative Innovation Center of IFSA(CICIFSA)Shanghai Jiao Tong UniversityShanghai 200240China

The efficiency and stability of typical three-dimensional(3D)MAPbI_(3)perovskite-based solar cells are highly restricted,due to the weak interaction between methylammonium(MA^(+))and[PbI 6]4-octahedra in the 3D structure,which can cause the ion migration and the related ***,we found that the in situ-grown perovskitoid TEAPbI_(3)layer on 3D MAPbI_(3)can inhibit the MA^(+)migration in a polar solvent,thus enhancing the thermal and moisture stability of perovskite *** crystal structure and orientation of TEAPbI_(3)are reported for the first time by single crystal and synchrotron radiation *** ultra-thin perovskitoid layer can reduce the trap states and accelerate photo-carrier diffusion in perovskite solar cells,as confirmed by ultra-fast *** power conversion efficiency of TEAPbI_(3)-MAPbI_(3)based solar cells increases from 18.87%to 21.79%with enhanced *** work suggests that passivation and stabilization by in situ-grown perovskitoid can be a promising strategy for efficient and stable perovskite solar cells.

关键词： Perovskite solar cell Stability MA migration Perovskitoid Ultra-thin layer

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铅卤钙钛矿敏化型太阳能电池的研究进展

化学学报 2015年第3期73卷 202-210页

作者：张太阳赵一新上海交通大学环境科学与工程学院上海200240

铅卤钙钛矿太阳能电池由于其低廉的成本,简易的制备工艺和具有商业化潜力的效率等优点,在最近两年里成为太阳能领域广受关注的新星.铅卤钙钛矿太阳能电池的结构,材料合成和制作工业在短时期内发生多项革命性的变化.铅卤钙钛矿敏化型太... 详细信息

铅卤钙钛矿太阳能电池由于其低廉的成本,简易的制备工艺和具有商业化潜力的效率等优点,在最近两年里成为太阳能领域广受关注的新星.铅卤钙钛矿太阳能电池的结构,材料合成和制作工业在短时期内发生多项革命性的变化.铅卤钙钛矿敏化型太阳能电池从最初使用液体电解液的敏化电池,演变为固态敏化电池.铅卤钙钛矿也从最初沉积在介孔膜的空隙的传统敏化结构,演变为介孔空隙填充和致密覆盖层结合的混合型敏化结构.通过这些结构的演化和材料制备的进步,敏化型铅卤钙钛矿太阳能电池具备了较高的稳定性和高效率的两大优点.对铅卤钙钛矿敏化型太阳能电池的研究进展进行简要综述.

关键词：铅卤钙钛矿太阳能电池敏化多孔型

A Controllable Fabrication of Grain Boundary PbI2 Nanoplates Passivated Lead Halide Perovskites for High Performance Solar Cells

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A Controllable Fabrication of Grain Boundary PbI2 Nanoplates...