Comparison of the Morphology Development of Polymer-Fullerene and Polymer-Polymer Solar Cells during Solution-Shearing Blade Coating

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• 作者：Xiaodan Gu ; Hongping Yan ; Tadanori Kurosawa ; Bob C. Schroeder ; Kevin L. Gu ; Yan Zhou ; John W. F. To ; Stefan D. Oosterhout ; Victoria Savikhin ; Francisco Molina-Lopez ; Christopher J. Tassone ; Stefan C. B. Mannsfeld ; Cheng Wang ; Michael F. Toney and Zhenan Bao
• 刊名：Advanced Energy Materials
• 出版年：2016
• 出版时间：November 23, 2016
• 年：2016
• 卷：6
• 期：22
• 全文大小：1919K
• ISSN：1614-6840

文摘

In this work, the detailed morphology studies of polymer poly(3-hexylthiophene-2,5-diyl) (P3HT):fullerene(PCBM) and polymer(P3HT):polymer naphthalene diimide thiophene (PNDIT) solar cell are presented to understand the challenge for getting high performance all-polymer solar cells. The in situ X-ray scattering and optical interferometry and ex situ hard and soft X-ray scattering and imaging techniques are used to characterize the bulk heterojunction (BHJ) ink during drying and in dried state. The crystallization of P3HT polymers in P3HT:PCBM bulk heterojunction shows very different behavior compared to that of P3HT:PNDIT BHJ due to different mobilities of P3HT in the donor:acceptor glass. Supplemented by the ex situ grazing incidence X-ray diffraction and soft X-ray scattering, PNDIT has a lower tendency to form a mixed phase with P3HT than PCBM, which may be the key to inhibit the donor polymer crystallization process, thus creating preferred small phase separation between the donor and acceptor polymer.