Vijaya Subbiah, Subbiah Jegadesan, Jones David J, Anandan Sambandam
Nanomaterials & Solar Energy Conversion Lab, Department of Chemistry, National Institute of Technology Tiruchirappalli-620015 India
Department of Physics, Vellore Institute of Technology Chennai India.
RSC Adv. 2023 Mar 29;13(15):9978-9982. doi: 10.1039/d3ra00365e. eCollection 2023 Mar 27.
Bismuth-based perovskites are an important class of materials in the fabrication of lead-free perovskite solar cells. Bi-based CsBiI and CsBiI perovskites are getting much attention due to their appropriate bandgap values of 2.05 eV and 1.77 eV, respectively. However, the device optimisation process plays a key role in controlling the film quality and the performance of perovskite solar cells. Hence, a new strategy to improve crystallization as well as the thin film quality is equally important to develop efficient perovskite solar cells. Herein, an attempt was made to prepare the Bi-based CsBiI and CsBiI perovskites the ligand-assisted re-precipitation approach (LARP). The physical, structural, and optical properties were investigated on perovskite films deposited by the solution process for solar cell applications. CsBiI and CsBiI-based perovskite-based solar cells were fabricated using the device architecture of ITO/NiO /perovskite layer/PCBM/BCP/Ag. The device fabricated with CsBiI showed the best power conversion efficiency (PCE) of 2.3% with an improved fill factor (FF) of 69%, of 0.79 V, and of 4.2 mA cm compared to the CsBiI-based device which showed a PCE of 0.7% with a FF of 47%, of 0.62 V and of 2.4 mA cm.
铋基钙钛矿是无铅钙钛矿太阳能电池制造中一类重要的材料。基于铋的CsBiI和CsBiI钙钛矿因其分别具有2.05 eV和1.77 eV的合适带隙值而备受关注。然而，器件优化过程在控制钙钛矿太阳能电池的薄膜质量和性能方面起着关键作用。因此，开发一种改善结晶以及薄膜质量的新策略对于开发高效的钙钛矿太阳能电池同样重要。在此，尝试采用配体辅助再沉淀法（LARP）制备铋基CsBiI和CsBiI钙钛矿。对通过溶液法沉积的用于太阳能电池应用的钙钛矿薄膜的物理、结构和光学性质进行了研究。使用ITO/NiO /钙钛矿层/PCBM/BCP/Ag的器件结构制造了基于CsBiI和CsBiI的钙钛矿太阳能电池。与基于CsBiI的器件相比，基于CsBiI制造的器件表现出最佳功率转换效率（PCE）为2.3%，填充因子（FF）提高到69%，开路电压为0.79 V，短路电流密度为4.2 mA cm ，而基于CsBiI的器件PCE为0.7%，FF为47%，开路电压为0.62 V，短路电流密度为2.4 mA cm 。
