学术讲座

首页 >> 学术讲座

理学院2017-2018学年春季第十二周学术报告(三)

发布时间:2018-05-16

学 术 报 告

报告题目New solution based approaches for high performance perovskite solar cells

报告学者Wallace C. H. Choy教授

报告者单位Department of Electrical and Electronic Engineering, The University of Hong Kong

报告时间2018年5月24日(星期四)下午2:00—3:00

报告地点光电所会议室

摘要We demonstrate that effective solution-based approaches to control the composition, morphology, and thus the quality of the perovskite films. With our theoretical prediction and understanding of the theoretical limit and electrical and optical properties of perovskite solar cells [1], we will firstly show that the vacuum-assisted thermal annealing can be used as an effective approach to control the composition, morphology, and thus the quality of the perovskite films formed from the precursors of PbCl2 and CH3NH3I for achieving high power conversion efficiency (PCE) perovskite solar cells. Remarkably, the complete elimination of CH3NH3Cl not only considerably improves the stability and reproducibility of the perovskite device (standard deviation in PCE of only 0.92% was achieved for 60 solar cells) [1]. By forming intermediate adducts at low temperature [3], we will report new room temperature solution-processed perovskite solar cells (PVSCs) with the features of PbI2 residue-free, large grain-sizes, and highly crystalline. Using our approach, the PVSC with no hysteresis, high power conversion efficiency of about 18% which is the best of the perovskite solar cells fabricated by low-temperature techniques to date [4]. In addition, using the formation of intermediate adducts, we can form perovskite nanograting patterns with simultaneously enhancement of crystallization and optical absorption [5, 6]. Regarding  hole transport layer (HTL), NiOx is a promising material for candidate for fabricating efficient PVSCs, the reported NiOx HTLs are formed using different multi-step treatments, which hindering its applications in PVSCs. Here, we demonstrate the flawless and surface-nanostructured NiOx nanoparticle film [7] from a simple and controllable room-temperature solution process [8]. We have also been working on ternary oxide such as NiCoOx functioning as effective HTL [9]. Recently, we have demonstrated stable and high performance solar cells with no hysteresis and PCE of 21.5%. The work contributes to the large-sale and low-cost production of perovskite solar cells with high device performances.

报告人简介: 蔡植豪博士(Prof./Dr. Wallace C.H. Choy),英国萨里大学取得博士学位, 现在是香港大学教授//博士生导师,美国学会院士 (OSA Fellow),美国电机及电子学工程师学会高级会员(IEEE Senior member)和英国特许工程师 (CEng), 多年从事半导体光电子器件的理论与实验研究,曾先后在加拿大国家研究中心、美国伊利诺斯大学、美国加州硅谷的日本富士通化合物半导体公司工作。在香港大学电子工程系主要从事有机小分子/聚合物,钙钛矿,和其它半导体薄膜太阳能电池以及发光二极管研究、纳米材料与器件包括材料生长、器件制备及其光电特性等的研究。到目前为止,在光电材料与器件方面发表论文180余篇,授予/申請專利8項。曾访问加州大学洛杉矶分校、德累斯顿技术大学、剑桥大学Cavendish Lab。蔡植豪博士根据汤姆森路透的基本科学指标(ESI)2014, 201, 2016及2017被认定为前1%引用最多的科學家(Top 1% most cited scientist)。他被評為有機太陽能電池prolific researcher in Nature Index Hong Kong published by Nature。他是他是香港研究资助局工程学学科组委员Nature Publishing Group-Scientific Reports, Wiley Solar RRL, IOP Journal Physics D的編委會成員, IEEE Photonics Journal的高级主编, 和OSA Journal of the Optical Society of America B的专题主编.

主办教师:梁春军

欢迎广大同学老师积极踊跃参加!