Faculty of Physics, University of Tabriz, Tabriz, Iran.
Research Institute for Applied Physics and Astronomy (RIAPA), University of Tabriz, Tabriz, Iran.
Sci Rep. 2023 May 22;13(1):8274. doi: 10.1038/s41598-023-35504-x.
Numerical simulation of an all-perovskite bilayer solar cell has been conducted by the SCAPS-1D. The presented structure employs MAPbI as a relatively wide bandgap (1.55 eV) top absorber and FAMAPbSnI as a narrow bandgap (1.25 eV) bottom absorber. The viability of the proposed design is accomplished in two steps. First, to validate this study, two inverted solar cells in standalone conditions are simulated and calibrated to fit previously reported state-of-the-art results. Second, both these devices are appraised for the bilayer configuration to boost their performances. Affecting parameters such as the thickness of perovskite absorbers, the work function of front and rear contacts, and the effect of temperature have been studied because solar cells are temperature-sensitive devices, and also carrier concentration and their mobility get overwhelmingly influenced as temperature increases. It is manifested that using bilayer structures could easily widen the absorption spectrum to the near-infrared region and significantly enhance the performance of the device which is mainly affected by the thickness of the FAMAPbSnI layer. Also, it has been found that the work function of the front contact has a prominent role with its optimal values being above 5 eV. Finally, the optimized inverted all-perovskite bilayer solar cell delivers a power conversion efficiency of 24.83%, fill factor of 79.4%, open circuit voltage of 0.9 V, and short circuit current density of 34.76 mA/cm at 275 K and a thickness of 100 nm and 600 nm for MAPbI and FAMAPbSnI, respectively.
通过 SCAPS-1D 对全钙钛矿双层太阳能电池进行了数值模拟。所提出的结构采用 MAPbI 作为相对较宽的带隙（1.55 eV）的顶部吸收体和 FAMAPbSnI 作为较窄的带隙（1.25 eV）的底部吸收体。通过两步实现了所提出设计的可行性。首先，为了验证本研究，模拟了两个独立条件下的倒置太阳能电池，并进行校准以拟合先前报道的最先进结果。其次，评估了这两种器件的双层结构以提高它们的性能。研究了影响参数，如钙钛矿吸收体的厚度、前后接触的功函数以及温度的影响，因为太阳能电池是对温度敏感的器件，而且随着温度的升高，载流子浓度及其迁移率会受到极大影响。结果表明，使用双层结构可以轻松地将吸收光谱扩展到近红外区域，并显著提高器件的性能，这主要受 FAMAPbSnI 层厚度的影响。此外，还发现前接触的功函数起着重要作用，其最佳值大于 5 eV。最后，优化后的倒置全钙钛矿双层太阳能电池在 275 K 下、厚度分别为 100nm 和 600nm 时，转换效率为 24.83%，填充因子为 79.4%，开路电压为 0.9 V，短路电流密度为 34.76 mA/cm2。
