High-Efficiency Perovskite/Silicon Tandem Solar Cells Based on Wide-Bandgap Perovskite Solar Cells with Unprecedented Fill Factor
Year: 2026
Type: article
Abstract: Recent progress in inverted perovskite solar cells (iPSCs) highlights the critical role of interface engineering between the charge transport layer and perovskite. Self-assembled monolayers (SAM) on transparent conductive oxide electrodes serve effectively as hole transport layers, though challenges such as energy mismatches and surface inhomogeneities remain. Here, a blended self-assembled monolayer of (2-(9H-carbazol-9-yl)ethyl)phosphonic acid (2PACz) and (4-(3,6-Dimethyl-9H-carbazol-9-yl)butyl)phosphonic acid (Me-4PACz) is developed, offering improved surface potential uniformity and interfacial energy alignment compared to individual SAMs. Interactions between the SAMs and ionic species are investigated with simulation analysis conducted, revealing the elimination of interfacial energy barriers through precise energy-level tuning. This strategy enables wide-bandgap (1.67 eV) perovskite solar cells with inverted structures with over 24% efficiency, an open-circuit voltage ( V oc ) of 1.268 V, and a certified fill factor (FF) of 86.8%, leading to a certified efficiency of 23.42%. The approach also enables high-efficiency semi-transparent devices and a mechanically stacked four-terminal perovskite/silicon tandem solar cell reaching 30.97% efficiency.
Source: Nano-Micro Letters
Authors: Li-Chun Chang, The Duong, Viqar Ahmad, Hualin Zhan, Anh Dinh Bui, Jana-Isabelle Polzin, Armin Richter, Gabriel Bartholazzi, Keqing Huang, Zhongshu Yang, Wei Wang, Yihui Hou, Li Li, Qian Cui, Rabin Basnet, Jianfei Yang, Hong Lin, Guozheng Du, Khoa Nguyen, Dang-Thuan Nguyen, Lachlan E. Black, Daniel MacDonald, Daniel Walter, Klaus J. Weber, Kylie R. Catchpole, Heping Shen
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,690
OpenAlex ID: W7123898349