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Recent progress in defect engineering for kesterite solar cells

Science China(Physics,Mechanics & Astronomy) 2023年第1期66卷 18-33页

作者： kaiwen sun Jialiang Huang Jianjun Li Chang Yan Xiaojing Hao Australian Centre for Advanced Photovoltaics School of Photovoltaic and Renewable Energy EngineeringUniversity of New South WalesSydney 2033Australia

Kesterite Cu_(2)ZnSn(S,Se)_(4)(CZTSSe)thin film solar cells have been regarded as one of the most promising thin film photovoltaic technologies,offering a low-cost and environmentally friendly solar energy *** remarkable advances have been achieved in kesterite solar cells,the performance gap relative to mature thin film photovoltaic technologies such as CIGSe and Cd Te remains *** open-circuit voltage(V_(OC))deficit has been recognized as the main limiting factor to performance improvement,with undesirable intrinsic defects being a key culprit contributing to the low V_(OC).To realize the promise inherent in kesterite CZTS to become an earth-abundant alternative to existing thin film photovoltaic technologies with comparable performance,significant research effort has been invested to tackle the challenging defect *** this review,recent progress and achievements relevant to engineering improvements to the defect properties of the semiconductor have been examined and *** strategies include:(i)manipulating the synthesis process to obtain a desirable reaction pathway and chemical environment;(ii)introducing cation substitution to increase the ionic size difference and supress the related band tailing deep-level defects;(iii)applying post deposition treatment(PDT)with alkaline elements to passivate the detrimental *** advances obtained from work on kesterite solar cells may lead to future high performance from this material and may be further extended to other earth-abundant chalcogenide photovoltaic technologies.

关键词： thin film solar cells kesterite solar cells Cu_(2)ZnSn(S,Se)_(4)(CZTSSe,CZTS) defect engineering

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Interface engineering of p-n heterojunction for kesterite photovoltaics:A progress review

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Journal of Energy Chemistry 2021年第9期30卷 1-8页

作者： Mingrui He kaiwen sun Mahesh P.Suryawanshi Jianjun Li Xiaojing Hao School of Photovoltaic and Renewable Energy Engineering University of New South WalesSydneyNSW 2052Australia

Kesterite Cu_(2)ZnSn(S,Se)_4(CZTSSe)is considered one or the most promising thin-film photovoltaic(PV)technologies due to its bandgap tunability(1.0~1.5 eV)and high absorption coefficient(>10^(4)cm^(-1)).However,the highest power conversion efficiency(PCE)of CZTSSe has so far only reached up to 12.6%,much lower than the theoretical limit defined by the Shockley-Queisser(SQ)*** large opencircuit voltage(V_(oc))deficit and inferior fill factor(FF)are prevalent in kesterite PV and hamper the improvement in *** this review,unfavourable energy band alignment at the CZTSSe/buffer junction,as well as defective interface are identified as two obstacles at the p-n *** issues contribute to the interface induced recombination,thus significantly reducing ***,we review recent advances in strategies to improve the efficiency by altering the characteristics of the interface,covering alternative buffer layers,heterojunction treatments and passivation ***,future research directions of heterojunction engineering are proposed as schemes towards the ideal interface in kesterite solar cells.

关键词： Kesterite Thin film Solar cell Heterojunction Interface

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Emergence of flexible kesterite solar cells:progress and perspectives

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npj Flexible Electronics 2023年第1期7卷 398-412页

作者： Jianjun Li kaiwen sun Xiaojie Yuan Jialiang Huang Martin A.Green Xiaojing Hao Australian Centre for Advanced Photovoltaics School of Photovoltaic and Renewable Energy EngineeringUniversity of New South WalesSydneyNSW 2052Australia

Flexible photovoltaics have been and will be increasingly in demand in modern and future society in various *** for ideal flexible photovoltaic technologies that can perfectly meet these expanding demands has long been an active branch of photovoltaic *** kesterite Cu_(2)ZnSn(S,Se)_(4)(CZTSSe)has emerged in recent years owning to its great potential to be an abundant,low-cost,stable,and high-efficiency‘green’photovoltaic material that can be widely deployed with the lowest detrimental environmental ***,we review the recent progress with flexible kesterite solar cells in thin-film and monograin technologies,discuss the key challenges and strategies associated with the flexible substrates,and finally provide the future perspectives on further pushing the efficiency toward commercial-competitive levels.

关键词： finally competitive flexible

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Over 12%efficient kesterite solar cell via back interface engineering

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Journal of Energy Chemistry 2022年第12期75卷 321-329,I0008页

作者： Yunhai Zhao Zixuan Yu Juguang Hu Zhuanghao Zheng Hongli Ma kaiwen sun Xiaojing Hao Guangxing Liang Ping Fan Xianghua Zhang Zhenghua Su Shenzhen Key Laboratory of Advanced Thin Films and Applications Key Laboratory of Optoelectronic Devices and SystemsCollege of Physics and Optoelectronic EngineeringShenzhen UniversityShenzhen 518060GuangdongChina CNRS ISCR(Institut des Sciences Chimiques de Rennes)UMR 6226Univ RennesRennes F-35000France School of Photovoltaic and Renewable Energy Engineering UNSW SydneySydney NSW 2052Australia Shenzhen University Institute of Microscale Optoelectronics Shenzhen UniversityShenzhen 518060GuangdongChina

Kesterite Cu_(2)ZnSn(S,Se)_(4)(CZTSSe)has attracted considerable attention as a non-toxic and earthabundant solar cell *** selenization of CZTSSe film at high temperature,the reaction between CZTSSe and Mo is one of the main reasons that result in unfavorable absorber and interface quality,which leads to large open circuit voltage deficit(VOC-def)and low fill factor(FF).Herein,a WO_(3)intermediate layer introduced at the back interface can effectually inhibit the unfavorable interface reaction between absorber and back electrode in the preliminary selenization progress;thus high-quality crystals are *** this back interface engineering,the traditional problems of phase segregation,voids in the absorber and over thick Mo(S,Se)_(2)at the back interface can be well solved,which greatly lessens the recombination in the bulk and at the *** increased minority carrier diffusion length,decreased barrier height at back interface contact and reduced deep acceptor defects give rise to systematic improvement in VOCand FF,finally a 12.66%conversion efficiency for CZTSSe solar cell has been *** work provides a simple way to fabricate highly efficient solar cells and promotes a deeper understanding of the function of intermediate layer at back interface in kesterite-based solar cells.

关键词： Cu_(2)ZnSn(S Se)_(4) WO_(3)intermediate layer Crystal growth Minority carrier diffusion length Interface contact quality

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11.39%efficiency Cu_(2)ZnSn(S,Se)_(4) solar cells from scrap brass

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SusMat 2022年第2期2卷 206-211页

作者： Yining Pan Chang Yan Xiangyun Zhao Wangxian Chen kaiwen sun Qing Wu Liming Ding Fangyang Liu School of Metallurgy and Environment Central South UniversityChangshaP.R.China Information and Network Centre Central South UniversityChangshaP.R.China Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijingP.R.China

Kesterite Cu2ZnSn(S,Se)4(CZTSSe)is one of the most promising next-generation thin-film photovoltaic materials due to its environmental friendliness and earthabundant constitutions,excellent optoelectronic properties(high absorption coefficient>104/cm and tunable band gap 1.0–1.5 eV)and high theoretical efficiency(32%).1,2 In 2014,12.6%3 efficiency was achieved by the IBM group using the hydrazine *** on the sputtering process,12.62%4 efficiency for CZTSSe and 12.5%5 efficiency for CZTSe have been achieved in recent ***ever,the highest efficiency has stuck around 12.6%for several ***,a breakthrough with certified 13%power conversion efficiency(PCE)has been demonstrated for CZTSSe thin-film solar cells,surpassing the dust-covered efficiency record since 2014.3,6 Along with the efficiency advancement of kesterite solar cells,a cost-effective fabrication process with low carbon footprint plays an increasingly important role considering the near-future industrialisation of this kind of solar cell with low energy payback time.

关键词： CZTSSe kesterite scrap brass

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Construction, characterization and application of a genomewide promoter library in Saccharomyces cerevisiae

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Frontiers of Chemical Science and Engineering 2017年第1期11卷 107-116页

作者： Ting Yuan Yakun Guo Junkai Dong Tianyi Li Tong Zhou kaiwen sun Mei Zhang Qingyu Wu Zhen Xie Yizhi Cai Limin Cao Junbiao Dai MOE Key Laboratory of Bioinformatics and Centre for Synthetic and Systems Biology School of Life Sciences Tsinghua University Beijing 100084 China College of Life Sciences Capital Normal University Beijing 100048 China MOE Key Laboratory of Bioinformatics and Bioinformatics Division Center for Synthetic and Systems Biology TNLIST/Department of Automation Tsinghua University Beijing 100084 China School of Biological Sciences The King's Buildings University of Edinburgh Edinburgh EH9 3BF UK

Promoters are critical elements to control gene expression but could behave differently under various growth conditions. Here we report the construction of a genome-wide promoter library, in which each native promoter in Saccharomyces cerevisiae was cloned upstream of a yellow fluorescent protein （YFP） reporter gene. Nine libraries were arbitrarily defined and assembled in bacteria. The resulting pools of promoters could be prepared and transformed into a yeast strain either as centromeric plasmids or integrated into a genomic locus upon enzymatic treatment. Using fluorescence activated cell sorting, we classified the yeast strains based on YFP fluorescence intensity and arbitrarily divided the entire library into 12 bins, representing weak to strong promoters. Several strong promoters were identified from the most active bins and their activities were assayed under different growth conditions. Finally, these promoters were applied to drive the expression of genes in xylose utilization to improve fermentation efficiency. Together, this library could provide a quick solution to identify and utilize desired promoters under user-defined growth conditions.

关键词： synthetic biology yeast promoter activity,metabolic engineering xylose utilization

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Record-level Cd-free kesterite Cu2ZnSnS4 solar cell with over 800 mV open-circuit voltage enabled by Ge incorporation

Record-level Cd-free kesterite Cu2ZnSnS4 solar cell with ove...

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第十届新型太阳能材料科学与技术学术研讨会

作者： Ao Wang Jialiang Huang kaiwen sun Martin A Green Xiaojing Hao Australian Centre for Advanced Photovoltaics School of Photovoltaic and Renewable Energy EngineeringUniversity of New South Wales

High-bandgap CuZnSnS (CZTS) solar cells have long suffered from significant opencircuit voltage (V) defects,which limit efficiency and further ***,state-of-the-art CZTS solar cells use the toxic CdS buffer layer,raising additional environmental ***,we use Ge incorporation,a facile and effective method,to alleviate the non-radiative recombination and enhance the V of CZTS solar *** a result,the average V improvement is around 60 mV,and the highest V we obtain in this work is over 800 *** should be noted that this V reaches 63.2%of its SchockleyQueisser limit,which is far higher than other pure sulfide CZTS,and even higher than most of the low bandgap CuZnSn(S,Se) solar cells despite the fact that they tend to suffer from less non-radiative *** importantly,we found that the Ge incorporation can alter the kesterite phase formation and crystallization,thereby contributing to high-quality CZTS ***,with the Cd-free ZnSnO buffer layer,we achieve a total-area efficiency of 10.7%,the highest efficiency of Cd-free CZTS solar cells up to *** integrating with other optimizations,a certified record efficiency of 11.2%is *** work breaks through the Voc bottleneck for high-bandgap CZTS,enabling further performance advances.

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Engineering the absorber defect of Kesterite solar cells

Engineering the absorber defect of Kesterite solar cells

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第八届新型太阳能材料科学与技术学术研讨会

作者： Xiaojing Hao Jianjun Li Mingrui He Jialiang Huang kaiwen sun Chang Yan Martin Green School of Photovoltaic and Renewable Energy Engineering UNSW Sydney

The Kesterite Cu ZnSn(S, Se)(CZTSSe) semiconductor is a compelling emerging light harvesting materials for low-cost, environment-benign, and high-efficiency thin-film photovoltaics. The highest power conversion efficiency(PCE) so far for kesterites are 11% and 12.6 % for pure sulphide kesterite and se-containing kesterite, respectively. The current state-of-the-art kesterite devices suffer from the long-standing challenge of controlling defects(e.g. cation—disordering defects and defect clusters), generally resulting in severe potential fluctuation, low minority carrier lifetime and thereby unsatisfactory device performance. Understanding the defects formation mechanism, and more importantly, identifying ways of controlling these defects is of vital importance for achieving further efficiency breakthroughs. In our recent work, we found that some of these defects can be modulated via both in-situ control of the local chemical environment(i.e. the oxidation states of cations and modifying the local chemical composition) during the synthesis of kesterite phase and lithium post deposition treatment. Notable that with the former in-situ defect control strategy, we demonstrated a confirmed 12.5% efficiency for CZTSe solar cells with high VOC of 491 mV, showing the promise of these defect control strategies. In this talk, the correlation of suppressed formation of detrimental intrinsic defects and associated improved kesterite device performance upon these defect-controlling strategies will be discussed.

关键词： kesterite defects cation

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Efficiency Improvement for Kesterite Solar Cells By Synergistic Cation Incorporation with Cd and Ge

Efficiency Improvement for Kesterite Solar Cells By Synergis...

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第九届新型太阳能材料科学与技术学术研讨会

作者： Xiaojing Hao Mingrui He Jialiang Huang Jianjun Li Chang Yan kaiwen sun Jialin Cong Martin Green School of Photovoltaic and Renewable Energy Engineering UNSW

Increasing the diversity of viable photovoltaic materials is critical to allow greater adaptability as the technology continues to expand and develop not only for further increasing the efficiency but also fulfill various application areas for everywhere PV. Kesterite is such a green energy material to capitalize this opportunity, utilizing equally sustainable energy materials for efficient energy conversion.

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废旧光伏组件回收技术研究进展

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中南大学学报（自然科学版） 2020年第12期51卷 3279-3288页

作者：周哲孙凯文蒋良兴贾明刘芳洋中南大学冶金与环境学院湖南长沙410083

近年来,全球光伏产业不断扩大,光伏装机量也逐渐提升。在光伏能源产业市场中,基于晶硅太阳电池的光伏组件目前处于主导地位,该类组件中含有大量的有价元素(铝、硅、银、铜和锡等),并且含有少量铅,将其丢弃和填埋会造成一定的资源浪费和... 详细信息

近年来,全球光伏产业不断扩大,光伏装机量也逐渐提升。在光伏能源产业市场中,基于晶硅太阳电池的光伏组件目前处于主导地位,该类组件中含有大量的有价元素(铝、硅、银、铜和锡等),并且含有少量铅,将其丢弃和填埋会造成一定的资源浪费和环境污染。本文通过对国内外相关文献进行分析,总结物理法和化学法两大主要组件回收方法。从组件的拆解、封装层的去除、有价元素的浸出和表面减反层的刻蚀技术4个方面分析现有回收技术存在的问题,对比不同回收方法所得产物回收率、产物价值和实际应用的可能性,为今后废旧光伏组件回收技术的发展提供参考和建议。

关键词：光伏组件回收 EVA去除湿法浸出刻蚀

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