Researchers Hu Hanlin, Lin Haoran, and Zhou Kang from Shenzhen Polytechnic University, along with Zhu Quanyao and Sun Huajun from Wuhan University of Technology, have introduced a new 1D perovskite material based on 1,3-thiazole-2-carboximidamide (TZC) cations. This 1D perovskite demonstrates strong chemical interactions with PbI₂ and 3D perovskites, enabling the preparation of high-quality mixed-dimensional perovskite films, which are critical for improving the photovoltaic (PV) performance and durability of both single-junction and tandem solar cells.
Regulation of Perovskite Crystallization Kinetics and Charge Transport
Low Formation Energy Barrier: Benefiting from the low formation energy barrier of 1D perovskites, they can preferentially form and act as crystal seeds to optimize film morphology, enhance crystallinity, and regulate perovskite crystallization dynamics.
Surface Defect Passivation and Nonradiative Recombination Suppression: In addition to effectively passivating surface defects and inhibiting nonradiative recombination, TZC endows the 1D perovskites with n-type doping characteristics, leading to an elevated Fermi level (from -4.63 eV to -4.44 eV) and improved charge carrier extraction and transport in p-i-n perovskite devices.
Enhanced Power Conversion Efficiency (PCE)
This strategy significantly improves the PCE of 1.55 eV bandgap perovskites and also boosts the PCE of 1.68 eV and 1.85 eV wide-bandgap perovskite devices, achieving 22.52% and 18.65% PCE, respectively.
