[17p-G202-1~21] 12.5 有機太陽電池

▼ [17p-G202-18] Origin of Open Circuit Voltage in wide band gap absorbers of all inorganic Cesium Perovskite Solar Cells

〇Teresa Ripolles¹、Chi Huey Ng²、Kengo Hamada¹、Siow Hwa Teo²、Hong Ngee Lim²、Juan Bisquert^3,4、Shuzi Hayase¹ (1.Kyushu Institute of Technology、2.Universiti Putra Malaysia、3.Institute of Advanced Materials、4.King Abdulaziz University)

キーワード：Renewable energy, Perovskite, Photovoltaic

Wide band gap absorbers were synthesized based on cesium lead bromide and iodide mixture in perovskite solar cells, CsPbBr_3-xI_x, where x varies between 0, 0.1, 0.2, and 0.3 molar ratio. High photoconvertion efficiencies were performed of 3.98 % for the perovskite composition of small amount of iodide as CsPbBr_2.9I_0.1. We observed that the open circuit voltage V_oc depends mainly of two factors, which are (i) the band gap of the perovskite and (ii) the work function of the hole transport material HTM. An increment in V_oc was observed for the device with larger perovskite band gap, while keeping the electron and hole extraction contacts the same. Additionally, the bilayer P3HT/MoO₃ with deeper HOMO level instead of spiro-OMeTAD as HTM, thus increased the V_oc from 1.16 V to 1.3 V for CsPbBr₃ solar cell, although the photocurrent is lowered due to charge extraction issues. The stability was also investigated which confirmed that the addition of small amount of iodide into the CsPbBr₃ perovskite is necessarily to stabilize the cell performance over time.