EN15.09.11 : Bandgap Tuning of Organo-Metal Halide Perovskite in Ternary Phase Diagram

5:00 PM–7:00 PM Apr 5, 2018 (America - Denver)

PCC North, 300 Level, Exhibit Hall C-E

Se-Yun Kim2 Seunghak Shin1 Si Hong Lee1 Ho-Chang Lee3 Jeong-Joo Kim1 Joon-Hyung Lee1 Chul Hong Park4 Sangwook Lee1 Young-Woo Heo1

2, Dague Gyeongbuk Institute of Science and Technology, Daegu, , Korea (the Republic of)
1, Kyungpook National University, Daegu, , Korea (the Republic of)
3, UNIST, Ulsan, , Korea (the Republic of)
4, Pusan National University, Pusan, , Korea (the Republic of)

Recently, halide perovskite materials, which have good photoelectric properties due to direct transition, high density of state of conduction band and intra-atomic transition, have been actively studied as photoelectric materials because of easy band tuning, low cost raw materials, low temperature process and flexibility. A complete band gap tuning characteristic by mixed halide perovskite was attractive enough to lead to investigations about tandem solar cell and LED as well as single-junction solar cell. Despite of many unprecedented results, there are still remained the critical problem such as environmental issues and long term instability. Among the various strategies to solve these problems, we focused on the development of a new composition and conducted the following research as first step. Herein, we report a phase diagram of MAPb(Br1-x-yClxIy)3 with bandgap of each composition, 0≤x≤1 and 0≤y≤1. Optical absorption, photoluminescence, and crystallographic structure of MAPb(Br1-x-yClxIy)3 are investigated in the forms of bulk powder which were synthesized via a simple solid-state reaction process. As the results, the ternary phase diagram having the vertex of MAPbI3, MAPbBr3 and MAPbCl3 was obtained with the maps of lattice constant, energy bandgap, and photoluminescence intensity. It was found that a certain bandgap value, in the range of 1.55 - 2.9 eV, can be built up from various combinatorial compositions. These interesting results could be understood based on the first principles calculation, from the view point of smooth orbital mixing