Tsai, Pei-TingPei-TingTsaiLi, Ming-ChinMing-ChinLiLai, Yi-ChunYi-ChunLaiTseng, Wei-HsuanWei-HsuanTsengWu, Chih-Chih-WuChen, Si-HanSi-HanChenLin, Yi-ChengYi-ChengLinChen, Yu-ChengYu-ChengChenHsiao, Rui-ChungRui-ChungHsiaoHorng, Sheng-FuSheng-FuHorngYu, PeichenPeichenYuCHIH-I WUYI-CHENG LIN2020-06-112020-06-1120161566-1199https://scholars.lib.ntu.edu.tw/handle/123456789/501648The 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]SDG7Blending; 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 cellsjournal article10.1016/j.orgel.2016.04.005WOS:000376457000037