Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23129
Title: Effect of PTB7 Properties on the Performance of PTB7:PC71BM Solar Cells
Authors: To, CH
Ng, A
Dong, Q
Djurišić, AB
Zapien, JA
Chan, WK
Surya, C 
Keywords: Polymer solar cells
Spectroscopic ellipsometry
Issue Date: 2015
Publisher: American Chemical Society
Source: ACS applied materials and interfaces, 2015, v. 7, no. 24, p. 13198-13207 How to cite?
Journal: ACS Applied Materials and Interfaces 
Abstract: The effect of poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexy)carbonyl]thieno[3,4-b]thiophenediyl]] (PTB7) properties on the optical properties, charge transport and photovoltaic performance of PTB7:[6,6]-phenyl C71 butyric acid methyl ester (PC71BM) blend films is investigated. We found that the variations in the molecular weight (Mw) and polydispersity index (PDI) of PTB7 mainly affect the phase separation and charge transport (hole mobility) in the blend films. The optical properties are also affected, but the increase in the extinction coefficient does not necessarily imply increased power conversion efficiency. The obtained power conversion efficiency for optimized thickness varied from 4.8% to 7.8% depending on the properties of PTB7. The wide range of obtained power conversion efficiencies illustrates the importance of optimizing the Mw and PDI to optimize bulk heterojunction morphology and achieve high performance solar cells.
URI: http://hdl.handle.net/10397/23129
ISSN: 1944-8244
DOI: 10.1021/am5085034
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