119th General Meeting of the KCS

Type Poster Presentation
Area 고분자화학
Room No. 포스터발표장
Time 4월 21일 (금요일) 13:00~14:30
Code POLY.P-13
Subject Highly efficient perovskite solar cells with long-term stability using dopant-free polymeric hole transporting materials
Authors 강경호, 박태호*
POSTECH 화학공학과, Korea
Abstract Hole transporting materials (HTMs) must be further developed to achieve high power conversion efficiency and stability in perovskite solar cells. We report a novel D–A polymeric HTM based on benzo[1,2-b:4,5:b']dithiophene (BDT) and 2,1,3-benzothiadiazole (BT), which results in highly efficient and stable perovskite solar cells. The hole mobility of synthesized polymeric HTM,RCP was 3.09 x 10^-3 cm^2 V^-1 s^-1 without any dopants. The RCP-based perovskite solar cell exhibits the highest efficiency (17.3%) in the absence of dopants [lithium bis(trifluoromethanesulfonyl)imide and tert-butylpyridine]. In addition, the long-term stability of the device is dramatically improved by avoiding deliquescent or hygroscopic dopants and by introducing a hydrophobic polymer layer. RCP devices maintain their initial efficiency for over 1400 h at 75% humidity, whereas devices made of HTMs with additives fail after 900 h.
E-mail kang7@postech.ac.kr