Effect of a symmetry breaking layer on the open circuit voltage of conventional bulk-heterojunction solar cells

被引：12

作者：

Kim, Heejoo ^{[2
,3
]}

Seo, Jung Hwa ^{[1
]}

Cho, Shinuk ^{[4
,5
]}

机构：

[1] Dong Univ, Dept Mat Phys, Pusan 604714, South Korea

[2] Gwangju Inst Sci & Technol, Heeger Ctr Adv Mat, Kwangju 500712, South Korea

[3] Gwangju Inst Sci & Technol, Inst Solar & Sustainable Energies, Kwangju 500712, South Korea

[4] Univ Ulsan, Dept Phys, Ulsan 680749, South Korea

[5] Univ Ulsan, EHSRC, Ulsan 680749, South Korea

来源：

APPLIED PHYSICS LETTERS | 2011年 / 99卷 / 21期

基金：

新加坡国家研究基金会;

关键词：

conducting polymers; electrochemical electrodes; fullerenes; interface phenomena; solar cells; spontaneous symmetry breaking; titanium compounds; ultraviolet photoelectron spectra; work function; POLYMER; FABRICATION;

D O I：

10.1063/1.3664227

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Solution processable titanium suboxide (TiOx) was introduced as an artificial symmetry breaking layer in bulk-heterojunction (BHJ) solar cells comprising a low band gap conjugated polymer, poly[(4,4'-bis(2-ethylhexyl)dithiene[3,2-b:2',3'-d]silole)-2,6-diyl-alt-(4,7-bis(2-thienyl)-2,1,3-benzothiadiazole)-5,5'-diyl] (Si-PCPDTBT), and a soluble fullerene, [6,6]-phenyl-C-71-butyric methyl ester (PC71BM). The inserted TiOx layer obviously extracted the same level of open circuit voltage (V-oc) regardless of metal work function. Ultraviolet photoelectron spectroscopy (UPS) results indicated that the formation of the interface dipole between the TiOx symmetry breaking layer and metal electrode successfully modifies the effective work function of the cathode electrode, thereby leading to symmetry breaking in BHJ solar cells. (C) 2011 American Institute of Physics. [doi:10.1063/1.3664227]

引用

页数：3

共 17 条

[1] Fabrication, Optical Modeling, and Color Characterization of Semitransparent Bulk-Heterojunction Organic Solar Cells in an Inverted Structure [J].