Tailoring Nanoscale Morphology of Polymer:Fullerene Blends Using Electrostatic Field

详细信息    查看全文

• 作者：Moneim ElshobakiRyan Gebhardt ; John Carr ; William Lindemann ; Wenjie Wang ; Eric Grieser ; Swaminathan Venkatesan ; Evan Ngo ; Ujjal Bhattacharjee ; Joseph Strzalka ; Zhang Jiang ; Qiquan Qiao ; Jacob Petrich ; David Vaknin ; Sumit Chaudhary
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2017
• 出版时间：January 25, 2017
• 年：2017
• 卷：9
• 期：3
• 页码：2678-2685
• 全文大小：625K
• ISSN：1944-8252

文摘

To tailor the nanomorphology in polymer/fullerene blends, we study the effect of electrostatic field (E-field) on the solidification of poly(3-hexylthiophene-2, 5-diyl) (P3HT):[6,6]-phenyl-C61-butyric acid methyl ester (PC₆₀BM) bulk heterojunction (BHJ). In addition to control; wet P3HT:PC₆₀BM thin films were exposed to E-field of Van de Graaff (VDG) generator at three different directions—horizontal (H), tilted (T), and vertical (V)—relative to the plane of the substrate. Surface and bulk characterizations of the field-treated BHJs affirmed that fullerene molecules can easily penetrate the spaghetti-like P3HT and move up and down following the E-field. Using E-field treatment, we achieved favorable morphologies with efficient charge separation, transport, and collection. We improve; (1) the hole mobility values up to 19.4 × 10^–4 ± 1.6 × 10^–4 cm² V^–1 s^–1 and (2) the power conversion efficiency (PCE) of conventional and inverted OPVs up to 2.58 ± 0.02% and 4.1 ± 0.40%, respectively. This E-field approach can serve as a new morphology-tuning technique, which is generally applicable to other polymer–fullerene systems.