| 초록 |
We synthesized a pure CH3NH3PbI3-xClx (MAPbI3-xClx) mixed halide perovskite powder via solution chemistry and applied it to the solar cells. Pure MAPbI3-xClx mixed halide perovskite powder was synthesized by reacting a 3 : 1 molar ratio of MAI : PbCl2 powder mixture in isopropanol (IPA) solution for 30 min at 60 °C with subsequent repeated centrifugation and washing in IPA. IPA functions as both the reaction medium for the formation of MAPbI3-xClx mixed halide and a selective remover of unreacted MAI and MACl byproducts. The deposited MAPbI3-xClx mixed halide perovskite film prepared by pure MAPbI3-xClx mixed halide perovskite powder revealed uniform composition throughout the entire area, and the ratio of Cl to I + Cl and I + Cl to Pb was constant at ∼0.03 and ∼1/3, respectively. The champion cell had 1.11 V Voc, 22.1 mA cm-2 Jsc, 77% F.F., and 18.9% η for forward scan conditions and 1.11 V Voc, 22.1 mA cm-2 Jsc, 78% F.F., and 19.1% η for reverse scan conditions. |
