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Superiority of Branched Side Chains in Spontaneous Nanowire Formation: Exemplified by Poly(3‐2‐methylbutylthiophene) for High‐Performance Solar Cells by Hsieh‐Chih Chen; I‐Che Wu; Jui‐Hsiang Hung; Fu‐Je Chen; I‐Wen P. Chen; Yung‐Kang Peng; Chao‐Sung Lin; Chun‐Hsien Chen; Yu‐Jane Sheng; Heng‐Kwong Tsao; Pi‐Tai Chou is a Engineering article available to read on EtoBox.

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## Abstract One‐dimensional nanostructures containing heterojunctions by conjugated polymers, such as nanowires, are expected to greatly facilitate efficient charge transfer in bulk‐heterojunction (BHJ) solar cells. Thus, a combined theoretical and experimental approach is pursued to explore spontaneous nanowire formation. A dissipative particle dynamics simulation is first performed to study the morphologies formed by rodlike polymers with various side‐chain structures. The results surprisingly predict that conjugated polymers with branched side chains are well suited to form thermodynamically stable nanowires. Proof of this concept is provided via the design and synthesis of a branched polymer of regioregular poly(3‐2‐methylbutylthiophene) (P3MBT), which successfully demonstrates highly dense nanowire formation free from any stringent conditions and stratagies. In BHJ solar cells fabricated using a blend of P3MBT and [6,6]‐phenyl‐C71‐butyric acid methyl ester (PC~71~BM), P3MBT polymers are self‐organized into highly crystalline nanowires with a __d__~100~ spacing of 13.30 Å. The hole mobility of the P3MBT:PC~71~BM (1:0.5 by weight) blend film reaches 3.83 × 10^−4^ cm^2^ V^−1^ s^−

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Author

Hsieh‐Chih Chen; I‐Che Wu; Jui‐Hsiang Hung; Fu‐Je Chen; I‐Wen P. Chen; Yung‐Kang Peng; Chao‐Sung Lin; Chun‐Hsien Chen; Yu‐Jane Sheng; Heng‐Kwong Tsao; Pi‐Tai Chou

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley - V C H Verlag GmbbH & Co.; Publons; Wiley (ISSN 1613-6810)

Published

2011

Language

EN

Field

Engineering (Physical Sciences)