美国莱斯大学Aditya D. Mohite报道了耐用和高效太阳能电池的3D/2D钙钛矿双层叠置的确定性制造。相关研究成果发表在2022年9月23日出版的《科学》。

实现溶液处理异质结构是卤化物钙钛矿中长期存在的挑战，因为溶剂不相容会破坏底层。

通过利用溶剂介电常数和Gutmann供体数，研究人员可以在3D钙钛矿上生长具有所需成分、厚度和带隙的纯相二维（2D）卤化物钙钛矿堆，而无需溶解底层衬底。表征表明，20纳米的3D–2D过渡区主要由底部3D层的粗糙度决定。二维钙钛矿层的厚度依赖性揭示了n-i-p和p-i-n结构的预期趋势，这与二维钙钛石的能带排列和载流子传输限制一致。研究人员测量了24.5%的光伏效率，T99（保持99%初始光伏效率所需的时间）的稳定性超过2000小时，这意味着3D/2D双层继承了2D钙钛矿的固有耐久性，而不影响效率。

附：英文原文

Title: Deterministic fabrication of 3D/2D perovskite bilayer stacks for durable and efficient solar cells

Author: Siraj Sidhik, Yafei Wang, Michael De Siena, Reza Asadpour, Andrew J. Torma, Tanguy Terlier, Kevin Ho, Wenbin Li, Anand B. Puthirath, Xinting Shuai, Ayush Agrawal, Boubacar Traore, Matthew Jones, Rajiv Giridharagopal, Pulickel M. Ajayan, Joseph Strzalka, David S. Ginger, Claudine Katan, Muhammad Ashraful Alam, Jacky Even, Mercouri G. Kanatzidis, Aditya D. Mohite

Issue&Volume: 2022-09-23

Abstract: Realizing solution-processed heterostructures is a long-enduring challenge in halide perovskites because of solvent incompatibilities that disrupt the underlying layer. By leveraging the solvent dielectric constant and Gutmann donor number, we could grow phase-pure two-dimensional (2D) halide perovskite stacks of the desired composition, thickness, and bandgap onto 3D perovskites without dissolving the underlying substrate. Characterization reveals a 3D–2D transition region of 20 nanometers mainly determined by the roughness of the bottom 3D layer. Thickness dependence of the 2D perovskite layer reveals the anticipated trends for n-i-p and p-i-n architectures, which is consistent with band alignment and carrier transport limits for 2D perovskites. We measured a photovoltaic efficiency of 24.5%, with exceptional stability of T99 (time required to preserve 99% of initial photovoltaic efficiency) of >2000 hours, implying that the 3D/2D bilayer inherits the intrinsic durability of 2D perovskite without compromising efficiency.

DOI: abq7652

Source: https://www.science.org/doi/10.1126/science.abq7652