[6p-A401-1~14] 1.4 Energy conversion, storage, resources and environment

▼ [6p-A401-7] Enhanced Power Conversion Efficiency of Perovskite Solar Cells Using CH₃NH₃Ba_1-xPb_xI_3-yCl_y as Active Layer

〇(D)Shunhsiang Chan¹, Mingchung Wu¹, Weifang Su² (1.Chang Gung Uni., 2.National Taiwan Uni.)

Keywords:perovskite solar cell, barium dopant, power conversion efficiency

The organic-inorganic lead halide perovskite solar cell is considered as one of the most promising technology for future photovoltaics because it shows high power conversion efficiency (PCE) and can be fabricated through a simple solution process. Non-toxic alkaline earth metal cations are suitable candidates to replace toxic lead in perovskite because they maintain the charge balance in perovskite and some of them meet tolerance factor of Goldschmidt’s rule. Hence, the Ba²⁺ were used to replace lead cations partially. The Ba²⁺ is most suitable for Pb²⁺ replacement in perovskite film and exhibits the best power conversion efficiency. Furthermore, we studied the crystal structure, absorption behavior and surface morphology of Ba²⁺-doped perovskite films with different doping levels systematically. The relationship between the charge carrier dynamics and Ba²⁺ concentration is investigated by time-resolved photoluminescence (TRPL) technique. The Ba²⁺-doped perovskite films are stable can be processed in the environment containing moisture (1.0% relative humidity). At the optimal 3.0 mol% Ba²⁺ replacement, the PCE of fabricated solar cell is increased from 11.8 to 14.0%, and the PCE of champion devices is as high as 14.9%.