Fluorinated and non-fluorinated conjugated polymers showing different photovoltaic properties in polymer solar cells with PFNBr interlayers

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• 作者：Zhiguo Zhao^a ; Yun Zhang^b ; ^{fanbenhu@iccas.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Yidan Wang^a ; Xiaojun Qin^a ; Junbo Wu^a ; ^{wujunbo@hnceri.com" class="auth_mail" title="E-mail the corresponding author} ; Jianhui Hou^b ; ^{hjhzlz@iccas.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Conjugated polymers ; Polymer solar cells ; Interlayer materials ; Device structure
• 刊名：Organic Electronics
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：28
• 期：Complete
• 页码：178-183
• 全文大小：1281 K

文摘

Photovoltaic properties of the two polymers (named as PBQ-0F and PBQ-4F) were investigated by employing [6, 6]-phenyl-C₇₁-butyric acid methyl ester (PC₇₁BM) as the acceptor and a water-alcohol-soluble polymer interlayer material (named as PFNBr) to fabricate photovoltaic devices. For the PBQ-0F:PC₇₁BM blend, the device using Ca/Al as cathode showed very similar efficiency as the device using PFNBr/Al as cathode, while for the PBQ-0F:PC₇₁BM blend, photovoltaic performance of the device can be distinctly improved by replacing Ca/Al with PFNBr/Al. As a result, the best PCE of the PBQ-4F:PC₇₁BM based devices reached 9.04%, which is much higher than that of the PBQ-0F:PC₇₁BM based devices. The results obtained from the quantum chemistry calculations and water contact angle measurements demonstrate that these two polymers are low polar materials, and also the films based on them have hydrophobic surfaces. Since PFNBr has an amphipathic structure (hydrophobic backbone and hydrophilic side chain) and the blend films of PBQ-4F:PC₇₁BM and PBQ-4F:PC₇₁BM have different surface energies, the PFNBr organization atop these two blend types of should be different, which will affect device photovoltaic performance.