Conference Publication
Coordination Dynamics of Green Solvents Tailor Solubility and Crystallization in Wide-Bandgap Perovskite Solar Cells
Author affiliations and roles
- 1Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan, Taiwan
- 2Center for Measurement Standards, Industrial Technology Research Institute, Hsinchu, 310, Taiwan, ROC
- 3Center for Sustainability and Energy Technologies, Chang Gung University, Taoyuan, Taiwan
- 4Division of Neonatology, Department of Pediatrics, Chang Gung Memorial Hospital, Linkou, Taoyuan, Taiwan
9th World Conference on Photovoltaic Energy Conversion (WCPEC-9) (2026).
Research topic: Perovskite Solar Cells
Conference information
Abstract
Perovskite solar cells are promising candidates for next-generation sustainable photovoltaics, yet single-junction devices are limited by the Shockley–Queisser efficiency ceiling. Tandem architectures incorporating wide-bandgap (WBG) absorbers offer a viable pathway to surpass this limit, but the fabrication of high-quality WBG perovskite films critically depends on precursor solubility and crystallization, which are governed by solvent coordination dynamics. Conventional solvents such as dimethylformamide (DMF) and dimethyl sulfoxide (DMSO) provide strong coordination with Pb²⁺ but suffer from toxicity and poor scalability. Here, we propose a green mixed-solvent system based on γ-valerolactone (GVL) and 2-methyltetrahydrofuran (2-MeTHF), which balances polarity, donor number, and boiling point to achieve favorable precursor solubility and controlled crystallization kinetics. This strategy yields uniform films with enlarged grain sizes (from 240 to 280 nm), enhanced open-circuit voltage (from 1.174 to 1.290 V), and improved power conversion efficiency (from 13.07% to 15.70%). These findings underscore the crucial role of solvent–precursor interactions in film formation and provide a sustainable route toward scalable, high-efficiency WBG perovskite solar cells.