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Surface passivation using pyridinium iodide for highly efficient planar perovskite solar cells

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Journal of Energy Chemistry 2021年第1期30卷 84-91,I0004页

作者： Yitian Du Jihuai Wu Xinpeng Zhang Qianjin Zhu Mingjing Zhang Xuping Liu Yu Zou Shibo Wang weihai sun Engineering Research Center of Environment-Friendly Functional Materials Ministry of EducationFujian Engineering Research Center of Green Functional MaterialsInstitute of Materials Physical ChemistryHuaqiao UniversityXiamen 361021FujianChina

Perovskite solar cells have developed rapidly in the past decades.However,there are large amounts of ionic defects at the surface and grain boundaries of perovskte films which are detrimental to both the efficiency and stability of perovskite solar cells.Here,an organic halide salt pyridinium iodide(PyI) is used in cation-anion-mixed perovskite for surface defect passivation.Different from the treatment with Lewis base pyridine(Py) which can only bind to the under-coordinated Pb ions,zwitterion molecule PyI can not only fill negative charged iodine vacancies,but also interact with positive charged defects.Compared with Py treatment,PyI treatment results in smoother surface,less defect densities and nonradiative recombination in perovskite,leading to an improved VOC, negligible J-V hysteresis and stable performance of devices.As a result,the champion PyI-treated planar perovskite solar cell with a high VOC of 1.187 V achieves an efficiency of 21.42%,which is higher than 20.37% of Py-treated device,while the pristine device without any treatment gets an efficiency of 18.83% at the same experiment conditions.

关键词： Perovskite solar cell Surface defect Passivation Pyridinium iodide

Chromium trioxide modified spiro-OMeTAD for highly efficient and stable planar perovskite solar cells

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Journal of Energy Chemistry 2021年第10期30卷 386-394,I0011页

作者： Xiaobing Wang Jihuai Wu Yuqian Yang Guodong Li Zeyu Song Xuping Liu weihai sun Zhang Lan Peng Gao Engineering Research Centre of Environment-Friendly Functional Materials Ministry of Education/Fujian Engineering Research Centre of Green Functional MaterialsHuaqiao UniversityXiamen 361021FujianChina Fujian Institute of Research on Structure Matter Chinese Academy ScienceCASXiamen 361021FujianChina

Hole transporting materials(HTMs)play an unparalleled role in heightening the stability and photovoltaic performance of perovskite solar cells(PSCs).The organic small molecule spiro-OMeTAD is frequently utilized for HTM in PSCs.However,the raw spiro-OMeTAD without dopant would be harmful to the development of highly efficient PSCs,due to its unsatisfied hole mobility and conductivity.Therefore,we introduce an inorganic dopant(chromium trioxide,CrO_(3))into the lithium-salt doped spiro-OMeTAD.Because of the exclamatory oxidizability of CrO_(3),it can accelerate the oxidation of spiro-OMeTAD and thereby enhancing the hole mobility of HTM.The introduction of CrO_(3) not only substantially decreases the density of defects,but also adjusts spiro-OMeTAD energy band,and thus effectively suppresses the hysteresis and improving stability of PSCs.In the end,we obtained a power conversion efficiency(PCE)as high as 22.6%after doping CrO_(3) in spiro-OMeTAD.The facile,low cost and outstanding photovoltaic performance render CrO_(3) an excellent dopant for HTMs in PSCs.

关键词： Perovskite solar cells Spiro-OMeTAD Hole transporting materials CrO_(3)

Solution processed inorganic V20x as interfacial function materials for inverted planar-heterojunction perovskite solar cells with enhanced efficiency

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Nano Research 2016年第10期9卷 2960-2971页

作者： Haitao Peng weihai sun Yunlong Li Senyun Ye Haixia Rao Weibo Yan Huanping Zhou Zuqiang Bian Chunhui Huang Department of Energy and Resources Engineering College of Engineering Peking University Beijing 100871 China State Key Laboratory of Rare Earth Materials Chemistry and Applications Peking University Beijing 10087 I China Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China

An inverted planar heterojunction perovskite solar cell （PSC） is one of the most competitive photovoltaic devices exhibiting a high power conversion efficiency （PCE） and nearly free hysteresis in the voltage-current output. However, the band alignment between the transport materials and the perovskite absorber has not been optimized, resulting in a lower open-circuit voltage （Voc） than that of regular PSCs. To address this issue, we tune the band alignment in perovskite photovoltaic architecture by introducing bilayer structured transport materials, e.g., the hole transport material poly（ethylenedioxythiophene）：poly（styrene sulfonate）（PEDOT：PSS）/V2Os. In this study, solution processed inorganic V2Ox interlayer is incorporated into PEDOT：PSS for achieving improved film surface properties as well as optical and electrical properties. For example, the work function （WF） was changed from 5.1 to 5.4 eV. A remarkably high PCE of 17.5% with nearly free hysteresis and a stabilized efficiency of 17.1% have been achieved. Electronic impedance spectra （EIS） demonstrate a significant increase in the recombination resistance after introducing the interlayer, associated with the high Voc output value of 1.05 V. Transient photocurrent and photovoltage measurements indicate that a comparable charge transport process and an inhibited recombination process occur in the PSC with the introduction of the V20x interlayer.

关键词： perovskite solar cells,vanadium oxide,hole transport layer,band alignment,hysteresis

Rapid and Complete Conversion of CH3NH3PbI3 for Perovskite/C60 Planar-Heterojunction Solar Cells by Two-Step Deposition

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Chinese Journal of Chemistry 2017年第5期35卷 687-692页

作者： weihai sun Yunlong Li Weibo Yan Haitao Peng Senyun Ye Haixia Rao Ziran Zhao Zhiwei Liu Zuqiang Bian Chunhui Huang Beijing National Laboratory for Molecular Sciences State Key Laboratory of Rare Earth Materials Chemistry and Applications Peking University Beijing 100871 China

In the present work,we proposed an improved two-step deposition method by optimizing the reaction temperature and the dipping time for the fabrication ofperovskite films.The perovskite film fabricated at 70 ℃ exhibits a full surface coverage and a smooth uniform crystal morphology with a particle size up to micrometer scale.The corresponding inverted perovskite solar cell with a structure of ITO/poly（3,4-ethylenedioxythiophene）：poly（styrene-sulfonate）（PEDOT：PSS）/CH3NH3PbI3/C60/2,9-dimethyl-4,7-diphenyl-l,l 0-phenanthroline （BCP）/Ag displayed a higher power conversion efficiency（PCE）of 13.6%than that of the device fabricated at 20 ℃ （8.06%）,as well as the high reproducibility.The small but meaningful modification for two-step deposition would provide an efficient and convenient way to optimize planar perovskite solar cells and facilitate the potential applications of perovskite solar cells more widely.

关键词： perovskite solar cell two-step deposition planar

NaHCO_(3)-induced porous PbI_(2) enabling efficient and stable perovskite solar cells

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InfoMat 2023年第6期5卷 66-77页

作者： Yitian Du Ying Wang Jihuai Wu Qi Chen Chunyan Deng Ran Ji Liuxue sun Lina Tan Xia Chen Yiming Xie Yunfang Huang Yana Vaynzof Peng Gao weihai sun Zhang Lan Engineering Research Center of Environment-Friendly Functional Materials Ministry of EducationInstitute of Materials Physical ChemistryHuaqiao UniversityXiamenthe People's Republic of China Integrated Centre for Applied Physics and Photonic Materials Technical University of DresdenDresdenGermany Chinese Academy of Science Xiamen Institute of Rare Earth MaterXiamenthe People's Republic of China

Driven by their many unique features,perovskite solar cells(PSCs)have become one of the most promising candidates in the photovoltaic field.Two-step preparation of perovskite film is advantageous for its higher stability and reproducibility compared to the one-step method,which is more suitable for practical application.However,the incomplete conversion of the dense lead iodide(PbI_(2))layer during the sequential spin-coating of formamidinium/methylammonium(FA^(+)/MA^(+))organic amine salts severely affect the performance of PSCs.Herein,sodium bicarbonate(NaHCO_(3))is used to induce the formation of porous PbI_(2),which facilitates the penetration of the FA^(+)/MA^(+)ions and the formation of a perovskite film with high crystallinity and large grain microstructure.Meanwhile,the introduction of Na^(+)not only improves the energetic alignment of the PSC,but also increases the conductivity via p-doping.As a result,the optimized NaHCO_(3)-modified PSC achieves a champion power conversion efficiency of 24.0% with suppressed hysteresis.Moreover,the significant reduction in defect density and ion migration as well as a mild alkaline environment enhance the stability of device.The unencapsulated NaHCO_(3)-modified PSCs maintain over 90% of their original efficiency upon storage in ambient air(30%–40% relative humidity)for 2160 h.We have demonstrated an ingenious strategy for controlling the quality of perovskite and improving the performance of device by low-temperature foaming of simple inorganic molecules of NaHCO_(3).

关键词： lead iodide(PbI_(2)) perovskite solar cell porous materials sodium bicarbonate(NaHCO_(3)) two-step deposition

I_(2)界面修饰对全无机CsPbBr_(3)钙钛矿太阳能电池性能的影响

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无机化学学报 2024年第7期40卷 1290-1300页

作者：王则远郑松志李浩翁敬菠王威汪杨孙伟海华侨大学材料科学与工程学院物理化学研究所环境友好功能材料教育部工程研究中心福建省光电功能材料重点实验室厦门361021

通过在CsPbBr_(3)薄膜上旋涂一次I_(2)的异丙醇溶液以修饰CsPbBr_(3)吸光层,钝化CsPbBr_(3)层表面缺陷,改善CsPbBr_(3)薄膜形貌。同时通过利用环境友好的绿色溶剂水溶解CsBr,显著提高了其溶解度,减少了旋涂次数,简化了电池制备流程。实... 详细信息

通过在CsPbBr_(3)薄膜上旋涂一次I_(2)的异丙醇溶液以修饰CsPbBr_(3)吸光层,钝化CsPbBr_(3)层表面缺陷,改善CsPbBr_(3)薄膜形貌。同时通过利用环境友好的绿色溶剂水溶解CsBr,显著提高了其溶解度,减少了旋涂次数,简化了电池制备流程。实验结果表明,在CsPbBr_(3)钙钛矿太阳能电池(perovskite solar cells,PSCs)中,使用5 mg·mL^(-1)I_(2)的异丙醇溶液界面修饰的器件具有最佳光伏性能,其最高开路电压(open-circuit voltage,V_(OC))为1.55 V,短路电流密度(short circuit current density,J_(SC))为7.45 mA·cm^(-2),填充因子(fill factor,FF)为85.54%,光电转换效率(photoelectric conversion efficiency,PCE)达到了9.88%。

关键词：全无机钙钛矿太阳能电池 CsPbBr_(3) I_(2)界面修饰

High-Speed Rubbing Behavior of Abrasive Coating Coated on Titanium Alloy Blade Tips

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Acta Metallurgica Sinica(English Letters) 2024年第4期37卷 749-762页

作者： Wenshuang Gu Shuai Yang Shiyi Zhang Zhiliang Pei weihai Xue Deli Duan Jun Gong Chao sun Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China

In aero-engines, abrasive coatings are typically utilized to protect the blade tip from excessive wear caused by the harder abradable sealing coating and thereby improve the sealing performance of engines. Therefore, a Ni/cBN abrasive coating was prepared on titanium alloy using electrodeposition. The high-speed rubbing tests with a linear velocity of 350 m/s and different incursion rates were performed to investigate the effect of the Ni/cBN abrasive coating on the wear behavior against NiCrAl/diatomite seal coating. Results showed that melting wear and adhesive transfer occurred on the bare blades, causing the bare blade to suffer excessive wear. While the Ni/cBN abrasive coating exhibited superior wear resistance and cutting performance. The cBN grits pullout, the abrasion of Ni matrix and transfer of seal coating to the cBN grits were the main wear mechanism of the Ni/cBN abrasive coating. Additionally, it was found that the relationship between the incursion rate and high-speed rubbing behavior is quite different for the bare blade and Ni/cBN coating. The reason for the difference in wear behavior of bare blade and Ni/cBN coating at different incursion rates was discussed in detail.

关键词： Gas turbine sealing Abrasive coating High-speed rubbing Material transfer Abradable coating

Synergistic ionic liquid in hole transport layers for highly stable and efficient perovskite solar cells

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Synergistic ionic liquid in hole transport layers for highly...

Tert-butyl peroxybenzoate-doped spiro-OMeTAD for perovskite solar cells with efficiency over 23%

第十届新型太阳能材料科学与技术学术研讨会

作者： Fengxian Cao Ziyao Zhu Chunhong Zhang Pengxu Chen Shibo Wang Anling Tong Ruowei He Ying Wang weihai sun Yunlong Li Jihuai Wu Engineering Research Center of Environment-Friendly Functional Materials Ministry of EducationInstitute of Materials Physical ChemistryHuaqiao University Shenzhen Institute of Advanced Technology Chinese Academy of Sciences

Perovskite solar cells(PSCs) with n-i-p structures often utilize an organic 2,2’,7,7’-tetrakis(N,N-di-p-methoxyphenyl-amine) 9,9’-spirobifluorene(spiro-OMeTAD) along with additives of lithium bis(trifluoromethanesulfonyl)imide salt(Li-TFSI) and tertbutylpyridine(t-BP) as the hole transporting layer(HTL).However,the HTL lacks stability in ambient air and numerous defects are often present on the perovskite surface,which is not conducive to a stable and efficient PSC.Therefore,constructive strategies that simultaneously stabilize spiro-OMeTAD and passivate the perovskite surface are required.In this work,we demonstrated that a novel ionic liquid of dimethylammonium bis(trifluoromethanesulfonyl)imide(DMATFSI) could act as a bifunctional HTL modulator in n-i-p PSCs.Adding DMATFSI to spiro-OMeTAD can effectively stabilize the oxidized spiro-OMeTAD cation radicals through the formation of spiro-OMeTADTFSI because of the excellent charge delocalization of the conjugated CFSO-moiety within TFSI.In addition,DMA cations could move toward the perovskite from the HTL,resulting in the passivation of defects at the perovskite surface.Accordingly,in this study,we achieved a power conversion efficiency of 23.22% for PSCs with DMATFSI-based spiro-OMeTAD.Moreover,benefiting from the improved ion migration barrier and hydrophobicity of the HTL,the devices still retained nearly 80% of their initial PCE after 36 days of exposure to ambient air.

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Tert-butyl peroxybenzoate-doped spiro-OMeTAD for perovskite ...