Enhancing P3HT/TiO2 Hybrid Photovoltaic Performance by Incorporating High Surface Potential Silica Nanodots into Hole Transport Layer

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• 作者：Jhih-Fong Lin ; Wei-Ben Wang ; Chun-Chih Ho ; Jwo-Huei. Jou ; Yang-Fang Chen ; Wei-Fang Su
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：January 19, 2012
• 年：2012
• 卷：116
• 期：2
• 页码：1955-1960
• 全文大小：423K
• 年卷期：v.116,no.2(January 19, 2012)
• ISSN：1932-7455

文摘

We offer a novel approach to improve the performance of P3HT/TiO₂ hybrid photovoltaic devices by incorporating either hydroxyl- or amino-functionalized silica nanodots (SND鈥揙H or SND鈥揘H₂) into the hole transport layer of the PEDOT:PSS. The SNDs serve as screens between conducting polymer and ionomer PSS to improve the phase separation and charge transport of the PEDOT:PSS hole transport layer. The power conversion efficiency (PCE) was thus improved by 1.45 and 2.61 fold for devices fabricated with PEDOT:PSS containing 1 wt % of SND鈥揙H (SND鈥揙H device) and 1 wt % of SND鈥揘H₂ (SND鈥揘H₂ device), respectively, when compared with the devices fabricated by neat PEDOT:PSS. The increase in PCE arises from an increase in short circuit currents, which are affected by the phase separation of PEDOT:PSS with possessing incorporated SNDs. The low surface potential of hydroxyl-functionalized SNDs (SND鈥揙H) is easily aggregated in the PEDOT:PSS solution and forms large-sized phase separation in the PEDOT:PSS film. The aggregation of SND鈥揙H causes slight decreases in the resistance of PEDOT:PSS thin film from (61 卤 1 to 69 卤 4)脳 10⁶ Ohm/square and a decrease in the shielding effects of the SNDs. In contrast, the high surface potential of amino-functionalized SNDs are dispersed uniformly in the PEDOT:PSS solution and form morphologies with small-sized domains in the PEDOT:PSS film. As a result, the sheet resistance of PEDOT:PSS thin films is decreased from (61 卤 1 to 46 卤 3) 脳 10⁶ Ohm/square. Therefore, the SND鈥揘H₂ device exhibits greater performance over the SND鈥揙H devices.