Lang Kun, Guo Qiang, He Zhangwei, Bai Yiming, Yao Jianxi, Wakeel Muhammad, Alhodaly Mohammed Sh, Hayat Tasawar, Tan Zhan'ao
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China.
Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450002, China.
J Phys Chem Lett. 2020 Nov 19;11(22):9596-9604. doi: 10.1021/acs.jpclett.0c02794. Epub 2020 Oct 29.
All-inorganic halide perovskite solar cells (PerSCs) have achieved rapid development in recent years. However, limited by narrow absorption bands, the power conversion efficiency (PCE) of all-inorganic halide PerSCs lag behind the organic-inorganic hybrid ones. In this contribution, to expand their absorption spectra and enhance the PCE, tandem solar cells (TSCs) with inorganic perovskite and organic conjugated molecules are constructed, utilizing CsPbIBr as an ultraviolet-visible light absorber and a PTB7-Th:IEICO-4F bulk-heterojunction (BHJ) active layer as a near-infrared light absorber. To physically and electronically connect the front and rear subcells, P3HT/MoO/Ag/PFN-Br is introduced as an interconnecting junction. Finally, the TSCs exhibit a remarkably higher PCE of 17.24% compared to that of the single junction PerSCs (12.09%) and organic solar cells (OSCs) (10.89%). These results indicate that the combination of all-inorganic perovskite and a low bandgap organic active layer for TSCs is a feasible approach to realize broad spectra utilization and efficiency enhancement.
近年来，全无机卤化物钙钛矿太阳能电池（PerSCs）取得了快速发展。然而，受限于窄吸收带，全无机卤化物PerSCs的功率转换效率（PCE）落后于有机-无机杂化太阳能电池。在本研究中，为了拓宽其吸收光谱并提高PCE，构建了由无机钙钛矿和有机共轭分子组成的串联太阳能电池（TSCs），其中CsPbIBr用作紫外-可见光吸收剂，PTB7-Th:IEICO-4F体异质结（BHJ）活性层用作近红外光吸收剂。为了在物理和电学上连接前后子电池，引入P3HT/MoO/Ag/PFN-Br作为互连结。最终，与单结PerSCs（12.09%）和有机太阳能电池（OSCs）（10.89%）相比，TSCs表现出显著更高的PCE，达到17.24%。这些结果表明，将全无机钙钛矿与低带隙有机活性层结合用于TSCs是实现宽光谱利用和效率提升的可行方法。
