High Fill Factor and Open Circuit Voltage in Organic Photovoltaic Cells with Diindenoperylene as Donor Material
High Fill Factor and Open Circuit Voltage in Organic Photovoltaic Cells with Diindenoperylene as Donor Material
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DOI：
10.1002/adfm.201001028
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发表时间：
2010-12
影响因子：
19
通讯作者：
J. Wagner;M. Gruber;A. Hinderhofer;A. Wilke;B. Bröker;Johannes Frisch;P. Amsalem;A. Vollmer;A. Opitz;N. Koch;F. Schreiber;W. Brütting
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文献类型：
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作者：
J. Wagner;M. Gruber;A. Hinderhofer;A. Wilke;B. Bröker;Johannes Frisch;P. Amsalem;A. Vollmer;A. Opitz;N. Koch;F. Schreiber;W. Brütting
展示了使用二茚并苝 (DIP) 作为新型供体材料并结合富勒烯 C60 作为电子受体的小分子光伏电池。除了在平面和体异质结器件中的成功应用之外，还给出了包括结构研究、能级排列的确定和电传输研究在内的全面分析，强调了生长条件、薄膜形态和器件性能之间的相关性。由于在高温下生长的 DIP 薄膜具有明显的结晶度和大表面积，因此平面异质结电池可实现几乎 75% 的极高填充因子。本体异质结表现出大规模相分离，形成两种分子物种的双连续网络，从而实现有效的激子解离和载流子传输。 DIP 的高电离势以及与富勒烯 C60 良好的能级对齐，在两种电池架构中产生接近 1 V 的大开路电压和约 4% 的可比功率转换效率。
Small‐molecule photovoltaic cells using diindenoperylene (DIP) as a new donor material in combination with the fullerene C60 as an electron acceptor are demonstrated. In addition to the successful application in planar and bulk heterojunction devices, a comprehensive analysis including structural studies, the determination of the energy level alignment and electrical transport investigations is given, stressing the correlation between growth conditions, film morphology, and device performance. Due to pronounced crystallinity and a large surface area of DIP films grown at elevated temperature, exceptionally high fill factors of almost 75% are achieved in planar heterojunction cells. Bulk heterojunctions exhibit large‐scale phase separation forming a bicontinuous network of both molecular species, which enables efficient exciton dissociation and charge carrier transport. The high ionization potential of DIP and the favorable energy level alignment with the fullerene C60 yield large open circuit voltages close to 1 V and comparable power conversion efficiencies of about 4% in both cell architectures.