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基于以上的基础研究，该团队将这种高稳定性的有机无机杂化二维钙钛矿用于场效应晶体管（FET），发现该材料对于FET的稳定性及层内电荷传输都有所提高 （J. Am. Chem. Soc. 2019, 39, 15577–15585）。近日，他们又开发了一种新型的杂化配体模式，进一步提升了层间电荷传输效率，探索了该材料在未来光电器件中应用的潜力（Small Science 2021）。长链共轭分子拥有较小的带隙，可以降低电荷传输的能垒，但是增大的无机层距离增加了电荷传输的距离。通过在长链共轭分子中掺杂入短链共轭分子，形成共轭有机配体混合物，可以使得二维钙钛矿层间配体形成如拉链般的穿插齿扣结构，减弱能垒的同时也有效地缩短了无机层之间的距离，同时增强了有机配体之间的作用力，从而加强了共轭有机分子的半导体性质在钙钛矿层间电荷传输中起的作用。这样的穿插配体结构通过提高电荷迁移率，延长电荷寿命，以及减弱空间电荷效应，进而使得层间电荷传输得到了进一步提升。电荷传输效率的提升进一步表现在了纯二维钙钛矿光伏器件的光电转换效率的提升上，尤其是光电流的提升。并且由该共轭有机分子制造的锡基二维钙钛矿光伏器件拥有极高的热稳定性及疏水稳定性。此发现为解决二维钙钛矿层间电荷传输的问题提供了新思路，有助于将来二维钙钛矿在光电器件中的进一步应用。 本文在线发表在Small Science 上（DOI：10.1002/smsc.202000024）。 作者介绍 Dr. Letian Dou is currently the Charles Davidson Chair Assistant Professor of Chemical Engineering at Purdue University. He obtained his B.S. in Chemistry from Peking University in 2009. He then joined Prof. Yang Yang’s group in the Department of Materials Science and Engineering at UCLA, and obtained his Ph.D. in 2014 (co-advised by Prof. Fred Wudl @UCSB in 2013). His doctoral research focused on the design and synthesis of conjugated polymers for organic photovoltaic applications. From 2014 to 2017, he was a Postdoc Fellow working with Prof. Peidong Yang at the Department of Chemistry, University of California-Berkeley and Materials Science Division, Lawrence Berkeley National Laboratory. His research interest includes the synthesis of organic semiconductors, inorganic nano structures, hybrid materials, and related optoelectronic properties and devices. He has published over 40 papers with more than 17000 citations. SMSC: What got you interested in science in the first place? What is the most attractive thing as a scientist? Dou: My passion in science originated from curiosity. I enjoy very much in discovery new knowledge in chemistry and physics. I also enjoy in solving practical problems using fundamental knowledges. SMSC: Who have influenced your career and thinking the most? Dou: My PhD advisor Prof. Yang Yang @ UCLA and postdoc advisor Prof. Peidong Yang @ UC Berkeley influenced me tremendously. They are both giants in academia and they taught me everything and turn me from a student into a scientist and a professor. In addition, I also leant a lot from Prof. Fred Wudl @ UCSB during my visit to his lab and Prof. Xinhua Wan during my undergrad study at Peking University. I’m very grateful to my advisors and mentors. SMSC: How do you see the current and future trends in Halide Perovskites for Photonics and Optoelectronics? Dou: This is an exciting area of research. Halide perovskite materials have amazing optical and electronic properties. Current research mainly focuses on fundamentals, but I hope many new technology breakthroughs will happen in the next few years and these materials will enable new devices (such as solar cell, lasers, LED, X-ray detectors) in commercial products. I think stability is one of the key issues now and materials chemistry will play a very important role here. SMSC: What kind of impact would you expect from your research on 2D perovskite heterostructures? Dou: Our work on perovskite heterostructure research 1) provides new fundamental understanding on the ion migration issue in halide perovskites, which may lead to better solutions to the stability problem; 2) opens up a new avenue towards integrated perovskite nanophotonics and nanoelectronics. SMSC: What do you think is the most important characteristic for a researcher? Could you give some advice for young researchers starting out in your field? Dou: I think I might be too young to answer this question. I think the most important characteristics are passion, curiosity, attitude, and perseverance. I encourage students and young researchers to be brave enough to think differently and take risks in doing research.
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