|
|
| Type |
Poster Presentation |
| Area |
Material Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
MAT.P-494 |
| Subject |
Pb-free metal halide perovskite materials: exceptionally enhanced air stability by chemical doping |
| Authors |
MYEONGJEONG LEE, CHUNG IN*
Division of Chemical & Biological Engineering, Seoul National University, Korea
|
| Abstract |
Lead-based metal halide perovskite solar cells exhibit the power conversion efficiency close to 20%. However, the toxicity of lead, a key component in perovskite solar cells, can be a barrier for commercialization of this technology. Alternatively, Sn-based metal halide perovskite compounds are a promising eco-friendly candidate because they show interesting physical properties and structural diversity. However, their sensitivity to air critically restricts their practical applications. In this presentation, we introduce that the air-stability of Sn-based perovskite materials can be exceptionally enhanced by the selective chemical doping. The chemical doping inhibits their unfavorable and spontaneous phase transition path from the perovskite to the non-perovskite structure. The doped perovskite material maintains its structure longer than a week in contrast to the pristine that fully deforms in 12 hours under the ambient condition. We also demonstrate unusually large shifts in energy gaps upon the chemical doping for Sn-based perovskite materials, in striking contrast to the Pb-based counterparts. These findings can help enhance the air-stability and finely tune the optical properties of Sn-based perovskite materials for various applications. |
| E-mail |
mjlee3897@snu.ac.kr |
|
121st General Meeting of the KCS