ISSN : 1225-0112(Print)
ISSN : 2288-4505(Online)
ISSN : 2288-4505(Online)
ZnO-free Inverted Polymer Solar Cells Based on New Viologen Derivative as a Cathode Buffer Layer
Abstract
A new viologen derivative namely 1,1’-bis(3,4-dihydroxybutyl)-[4,4’-bipyridine]-1,1’-diium bromide (V-Pr-2OH) was synthesized and applied as a cathode buffer layer to inverted polymer solar cells (PSCs) based on the blend of PTB7 : PC71BM. PSCs with the structure of ITO/V-Pr-2OH/PTB7 : PC71BM/MoO3/Ag as the cathode buffer layer showed the power conversion efficiency (PCE) up to 7.28%, which is comparable to that of the PSCs with the structure of ITO/ZnO/PTB7 : PC71BM/MoO3/Ag (7.44%) in the absence of V-Pr-2OH. This study demonstrates that a highly efficient PSCs without any high temperature heat treatment can be obtained.
ZnO를 대체 가능한 새로운 Viologen 유도체가 적용된 역구조 고분자 태양전지
초록
새로운 viologen 유도체인 1,1’-bis(3,4-dihydroxybutyl)-[4,4’-bipyridine]-1,1’-diium bromide (V-Pr-2OH)을 합성하여 PTB7 : PC71BM Blend를 기반으로 하는 inverted polymer solar cells (iPSCs)에 cathode buffer layer로 적용하였다. V-Pr-2OH이cathode buffer layer로 적용된 PSCs (ITO/V-Pr-2OH/PTB7 : PC71BM/MoO3/Ag)의 power conversion efficiency (PCE)는 7.28% 이었다. V-Pr-2OH이 없는 iPSCs (ITO/ZnO/PTB7 : PC71BM/MoO3/Ag)의 PCE (7.41%)에 상응하는 값이다. 그러므로 본연구에서는 높은 열처리 공정이 필요한 ZnO가 배제된, 즉 높은 온도의 열처리 없이도 제작 가능한 PSC에 대한 가능성을 보여주고 있다.