New interfacial materials for rapid hole-extraction in organic photovoltaic cells

作者：Kulshreshtha Chandramouli^*; Kim Gyeong Woo; Lampande Raju; Huh Dal Ho; Chae Miyoung; Kwon Jang Hyuk

来源：Journal of Materials Chemistry A, 2013, 1(12): 4077-4082.

DOI：10.1039/c3ta00808h

Two new hole-extraction materials, TPDI (5,10,15-triphenyl-5H-diindolo[3,2-a:3%26apos;,2%26apos;-c]carbazole) and TBDI (5,10,15-tribenzyl-5H-diindolo[3,2-a:3%26apos;,2%26apos;-c]carbazole), were synthesized and explored in planar heterojunction organic solar cells (OSCs). The synthesized materials have good transparency in the visible spectrum, high hole mobility, and compatible highest occupied molecular orbital (HOMO) values with the donor material, which make them excellent hole-extraction layers (HELs) for OSCs. The SubPc (subphthalocyanine chloride)/C-60 and SubNc (subnaphthalocyanine chloride)/C60 OSCs with a TBDI HEL show impressive 35.9% and 29.1% improvements in power conversion efficiencies compared to reference devices. Their HOMO values were evaluated as 5.2-5.3 eV and hole mobilities were measured as 5.9-6.1 x 10(-3) cm(2) V-1 s(-1) at 0.3 MV cm(-1) by the space-charge limited current method.

• 出版日期2013