Synthesis, characterization, and solar cell and transistor applications of phenanthro[1, 2‐b:8, 7‐b′]dithiophene–Diketopyrrolopyrrole semiconducting polymers. Issue 5 (6th January 2015)

• Record Type: Journal Article
• Authors: Mori, Hiroki; Suetsugu, Masato; Nishinaga, Shuhei; Chang, Ning‐hui; Nonobe, Hikaru; Okuda, Yasuhiro; Nishihara, Yasushi
• Is Part Of: Journal of polymer science. Volume 53:Issue 5(2015:Mar.)
• Page Start: 709
• Page End: 718
• Publication Date: 2015-01-06
• Subjects: 547
• DOI: 10.1002/pola.27500
• Languages: English
• ISSNs: 0887-624X

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>Synthesis, characterization, and polymer solar cell and transistor application of a series of phenanthro[1, 2‐<italic>b</italic>:8, 7‐<italic>b</italic>′]dithiophene‐based donor–acceptor (D–A)‐type semiconducting polymers combined with a diketopyrrolopyrrole unit are reported. The present polymers showed some unique features such as strong aggregation behavior, high thermal stability, and short <italic>π–π</italic> stacking distance (3.5–3.6 Å), which are suitable for high performance organic materials. In addition, they have a significantly extended absorption up to 1000 nm with a band gap of ca. 1.2 eV. However, such strong intermolecular interaction reduced their solubility and molecular weights, which resulted in low crystalline nature and moderate field‐effect mobility of 0.01 cm² V⁻¹ s⁻¹. Furthermore, such strong aggregation behavior led to the large‐scale phase separation in the blend films, which may prevent the effective photocurrent generation, limiting <italic>J</italic>_sc and power conversion efficiency of 2.0%. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. <bold>2015</bold>, <italic>53</italic>, 709–718</p> </abstract>