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Time-resolved photoluminescence:a precision tool for shallow trap density determination in perovskite films

Chinese Optics Letters 2024年第8期22卷 124-130页

作者： Wei Chen Yifeng Shi Pengxiang Wang Guodong Zhang Hu Wang Yifan Zheng Yuchuan Shao Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China School of Material Science and Technology ShanghaiTech UniversityShanghai 201210China

Determining the trap density in the absorbing layer thin film of perovskite solar cells is a critically important task,as it directly influences the efficiency of the ***,we proposed time-resolved photoluminescence(TRPL)as a nondestructive method to assess trap density.A model was constructed to investigate carrier recombination and transition in perovskite *** model was utilized for numerical calculations and successfully fitted TRPL signals of perovskite ***,a genetic algorithm was employed to optimize the ***,statistical methods were applied to obtain the parameters associated with the trap states of the *** approach facilitates the successful determination of trap densities for different samples with clear differentiation.

关键词： perovskite solar cell time-resolved photoluminescence genetic algorithm trap density methylammonium lead triiodide

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Effects of electron-and hole-current hysteresis on trap characterization in organo-inorganic halide perovskite

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Journal of Energy Chemistry 2023年第1期76卷 414-420,I0010页

作者： Fan Wu Sally Mabrouk Miaomiao Han Yanhua Tong Tiansheng Zhang Yuchen Zhang Raja Sekhar Bobba Quinn Qiao School of Science and Huzhou Key Lab of Materials for Energy Conversion and Storage Huzhou UniversityHuzhou 313000ZhejiangChina Mechanical and Aerospace Engineering Syracuse UniversitySyracuseNY13244United States

Charge trap density and carrier mobility of perovskite materials are the critical properties of perovskite solar *** space charge limited current(SCLC)method,which measures a dark current–voltage(I-V)curve of a single-carrier device has found extensive use for studying the trap density and charge carrier mobility in perovskite ***,it was found that the electron-and hole-current in organo-lead perovskite-based single-carrier device undergoes significant hysteresis under forward and reverse scanning due to the mobile *** addition,it was also observed that measuring history has a detrimental effect on hysteresis resulting in possible overestimation or underestimation of the extracted electrical values from the SCLC *** the forward/reverse scanning process,the mobile ionic defects enhance/shield the charge in the traps due to ionic charging/discharging,thereby increasing/reducing the interface barrier and net charge in the I-V scanning,which in turn affects the determination of transport properties of the *** results raise quite a few doubts over the direct application of classical SCLC measurements for the accurate characterization of intrinsic transport properties of the mixed ionicelectronic perovskite.

关键词： Organo-lead perovskite Ionic defects Space-charge-limited-current trap density Mobility

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Revealing the Unusual Efficiency Enhancement of Organic Solar Cells with Polymer-Donor-Treated Cathode Contacts

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Chinese Journal of Polymer Science 2022年第8期40卷 937-943,I0009页

作者： Zesheng Liu Yawen Li Xiaojun Zhao Yufan Zhu Yuze Lin Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

The metal oxides with low trap density of states as the electron transport layer are crucial for the high performance of the organic solar cells(OSCs).It is universally acknowledged that modifying n-type metal oxide contacts with polymer donors will harm the carrier extraction on account of the mismatched energy ***,we find that modifying interlayer consisting of the alcohol amines with some polymer donor additive can unusually enhance the performance of the *** with triethanolamine(TEA)passivated ZnO,TEA:polymer donor treated ZnO shows lower trap density and enhances electron mobility resulting in higher current density in OSC ***,we reveal that the enhanced oxygen-defect passivation ability of TEA with polymer additive is attributed to the enhanced negative electrostatic potential of TEA owing to the hydrogen bond formation between the polymer and the hydroxyl group in *** strategy that enhancing the negative electrostatic potential of the passivators for improving oxygen defect passivation can be extended to other types of organic electronic devices.

关键词： Organic solar cell Electron transport layer trap density Passivation Hydrogen bond

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Smelting recrystallization of CsPbBrI_(2)perovskites for indoor and outdoor photovoltaics

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eScience 2021年第1期1卷 53-59页

作者： Kai-Li Wang Ying-Guo Yang Yan-Hui Lou Meng Li Femi Igbari Jun-Jie Cao Jing Chen Wen-Fan Yang Chong Dong Lina Li Ren-Zhong Tai Zhao-Kui Wang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Shanghai Synchrotron Radiation Facility(SSRF) Shanghai Advanced Research InstituteShanghai Institute of Applied PhysicsChinese Academy of Sciences239 Zhangheng RoadShanghai 201204China College of Energy Soochow Institute for Energy and Materials Innovations Soochow University Suzhou 215006 China

A smelting multiple recrystallization strategy and its effects on the morphology,composition,and defects of CsPbBrI_(2)film were *** optimal number(n=2)of recrystallization cycles improved the crystallinity and phase purity,minimized the grain boundaries,and optimized the crystal structure,yielding a high-quality perovskite film with significantly reduced defects *** corresponding photovoltaic devices exhibited a champion efficiency of 16.02%under AM 1.5 G illumination and presented an even higher indoor efficiency of 33.50%under an LED(2956 K,P_(in):334.41𝜇W/cm^(2)).This recrystallization method offers a promising strategy for developing high-performance indoor and outdoor *** recrystallization in the cells was also explored to achieve enhanced stability and longer lifetime in humid conditions.

关键词： Perovskite solar cells Recrystallization trap density Indoor Inorganic

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Photoconductivity under Pulsed Excitation

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Advances in Pure Mathematics 2022年第6期12卷 419-426页

作者： Ilhan Michael Izmirli George Mason University Fairfax USA

Ever since its mid nineteenth century inauguration, the logistic function and its numerous applications have received a great deal of attention from engineers, and natural and social scientists. In particular, its discrete relative, the logistic map, has proven to be a principal and indispensable tool of scientists in their effort to describe the dynamics of a variety of physical and biological systems. Our purpose in this paper is to describe one such application, namely, photoconductivity under pulsed excitation and show that the solution of the energy-independent kinetic rate equation for electron density can be expressed as a logistic map.

关键词： Photoconductivity Logistic Map Band Structure Fermi Level Recombination Coefficient trap density

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Control Effect of Sex Pherom one Lure against the Asian Corn Borer( Ostrinia furnacalis) in Field

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Plant Diseases and Pests 2015年第6期6卷 24-25,40页

作者： Sha Honglin Chi Chang Ma Wei Institute of Agricultural Environment and Resources Research Jilin Academy of Agricultural Sciences

We studied the trapping effects on Ostrinia furnacalis from the aspects of different hanging heights and different color traps. The results suggested that the hanging height of 1.5 - 2.0 m received a better trapping effect, but trap color had little impact on trapping effect. The sex pheromone traps at different densities were placed in corn field. The results showed that sex pheromone lure could trap adult O. furnacalis, and it was feasible to apply sex pheromone in short term fore- cast. Meanwhile, it reduced the number of larvae and eggs, thereby reducing the damage of O. furnacalis. The lure number of 10 per hm2 was more appropriate, which could result in increasing yield of 8.61% compared with control

关键词： Ostrinia furnacalis Sex pheromone Field control trap density

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To probe the performance of perovskite memory device:defects property and hysteresis

To probe the performance of perovskite memory device:defects...

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第四届新型太阳能电池学术研讨会

作者： Ziqi Xu Nengxu Li Guanhaojie Zheng Qi Chen Huanping Zhou Happy Lab College of EngineeringPeking University

Hybrid organic-inorganic perovskite materials offer a range of interesting characteristics that are suitable for optoelectronic devices, such as *** with fast rise of the device performance, a current density-voltage(J-V) hysteresis originated from defects and their movement has attracted intensive attention, which renders challenges regarding stability and reliability of the novel ***, we carefully probe the defects effects in the perovskite materials and across interfaces within the device, in which the bistable conductive states are achieved for the next generation nonvolatile *** memory device shows the operate voltage as low as 0.25 V, and a decent on/off *** importantly, we correlate the defect density and hysteresis-index of different perovskite films to the corresponding memory device *** findings enrich the understanding of working mechanism of perovskite memory devices, which also benefit other organic-inorganic hybrid perovskite optoelectronics.

关键词： perovskite memory device set voltage trap density hysteresis

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