Lin Chun-Ho, Hu Long, Guan Xinwei, Kim Jiyun, Huang Chien-Yu, Huang Jing-Kai, Singh Simrjit, Wu Tom
School of Materials Science and Engineering, University of New South Wales (UNSW), Sydney, New South Wales, 2052, Australia.
Adv Mater. 2022 May;34(18):e2108616. doi: 10.1002/adma.202108616. Epub 2022 Mar 11.
Contact engineering is a prerequisite for achieving desirable functionality and performance of semiconductor electronics, which is particularly critical for organic-inorganic hybrid halide perovskites due to their ionic nature and highly reactive interfaces. Although the interfaces between perovskites and charge-transporting layers have attracted lots of attention due to the photovoltaic and light-emitting diode applications, achieving reliable perovskite/electrode contacts for electronic devices, such as transistors and memories, remains as a bottleneck. Herein, a critical review on the elusive nature of perovskite/electrode interfaces with a focus on the interfacial electrochemistry effects is presented. The basic guidelines of electrode selection are given for establishing non-polarized interfaces and optimal energy level alignment for perovskite materials. Furthermore, state-of-the-art strategies on interface-related electrode engineering are reviewed and discussed, which aim at achieving ohmic transport and eliminating hysteresis in perovskite devices. The role and multiple functionalities of self-assembled monolayers that offer a unique approach toward improving perovskite/electrode contacts are also discussed. The insights on electrode engineering pave the way to advancing stable and reliable perovskite devices in diverse electronic applications.
接触工程是实现半导体电子产品理想功能和性能的前提条件，由于其离子性质和高活性界面，这对于有机-无机杂化卤化物钙钛矿尤为关键。尽管由于光伏和发光二极管应用，钙钛矿与电荷传输层之间的界面已引起广泛关注，但实现用于晶体管和存储器等电子器件的可靠钙钛矿/电极接触仍然是一个瓶颈。在此，本文对钙钛矿/电极界面难以捉摸的性质进行了批判性综述，重点关注界面电化学效应。给出了电极选择的基本准则，以建立非极化界面并实现钙钛矿材料的最佳能级对准。此外，还对旨在实现钙钛矿器件欧姆传输和消除滞后现象的与界面相关的电极工程的最新策略进行了综述和讨论。还讨论了自组装单分子层在改善钙钛矿/电极接触方面的独特作用和多种功能。对电极工程的见解为在各种电子应用中推进稳定可靠的钙钛矿器件铺平了道路。
