Solution p-doped fluorescent polymers for enhanced charge transport of hybrid organic-silicon nanowire photovoltaics
Journal
Organic Electronics
Journal Volume
34
Pages
246-253
Date Issued
2016
Author(s)
Tsai, Pei-Ting
Li, Ming-Chin
Lai, Yi-Chun
Tseng, Wei-Hsuan
Wu, Chih-
Chen, Si-Han
Lin, Yi-Cheng
Chen, Yu-Cheng
Hsiao, Rui-Chung
Horng, Sheng-Fu
Yu, Peichen
Abstract
The solution p-type doping of various conjugated polymers and small molecules via blending with tetrafluorotetracyano-quinodimethane (F4-TCNQ) is investigated to facilitate hole transport for hybrid organic-silicon-nanowire solar cells. Among all, the highly-fluorescent conjugated polymers such as poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO) demonstrate superior transport characteristics, where both the device fill-factor and power conversion efficiency (PCE) are positively correlated with the doping concentration. The best PCE achieves 13.66% from the device with 30% p-doped PFO, compared to the reference at 12.50%. The enhancement is ascribed to the efficient interfacial charge-carrier recombination with minimal energy losses. A vertically graded doping profile is further revealed with F4-TCNQ molecules preferentially accumulated near the silicon surface. © 2016 Elsevier B.V. All rights reserved.
SDGs
Other Subjects
Blending; Cell engineering; Charge transfer; Conjugated polymers; Energy dissipation; Fluorescence; Heterojunctions; Molecules; Nanowires; Phosphorus; Silicon; Solar cells; Doping concentration; Fluorescent conjugated polymers; Graded doping profiles; Hybrid solar cells; Interface engineering; Power conversion efficiencies; Surface recombinations; Transport characteristics; Polymer solar cells
Type
journal article