Ternary Blend Composed of Two Organic Donors and One Acceptor for Active Layer of High-Performance Organic Solar Cells

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• 作者：Jong Won Lee ; Yoon Suk Choi ; Hyungju Ahn ; Won Ho Jo
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2016
• 出版时间：May 4, 2016
• 年：2016
• 卷：8
• 期：17
• 页码：10961-10967
• 全文大小：490K
• 年卷期：0
• ISSN：1944-8252

文摘

Ternary blends composed of two donor absorbers with complementary absorptions provide an opportunity to enhance the short-circuit current and thus the power conversion efficiency (PCE) of organic solar cells. In addition to complementary absorption of two donors, ternary blends may exhibit favorable morphology for high-performance solar cells when one chooses properly the donor pair. For this purpose, we develop a ternary blend with two donors (diketopyrrolopyrrole-based polymer (PTDPP2T) and small molecule ((TDPP)₂Ph)) and one acceptor (PC₇₁BM). The solar cell made of a ternary blend with 10 wt % (TDPP)₂Ph exhibits higher PCE of 7.49% as compared with the solar cells with binary blends, PTDPP2T:PC₇₁BM (6.58%) and (TDPP)₂Ph:PC₇₁BM (3.21%). The higher PCE of the ternary blend solar cell is attributed mainly to complementary absorption of two donors. However, a further increase in (TDPP)₂Ph content in the ternary blend (>10 wt %) decreases the PCE. The ternary blend with 10 wt % (TDPP)₂Ph exhibits well-developed morphology with narrow-sized fibrils while the blend with 15 wt % (TDPP)₂Ph shows phase separation with large-sized domains, demonstrating that the phase morphology and compatibility of ternary blend are important factors to achieve a high-performance solar cell made of ternary blends.