https://scholars.lib.ntu.edu.tw/handle/123456789/392267
Title: | Interplay of Molecular Orientation, Film Formation, and Optoelectronic Properties on Isoindigo- and Thienoisoindigo-Based Copolymers for Organic Field Effect Transistor and Organic Photovoltaic Applications | Authors: | Lu, C. Chen, H.-C. Chuang, W.-T. Hsu, Y.-H. WEN-CHANG CHEN PI-TAI CHOU |
Issue Date: | 2015 | Journal Volume: | 27 | Journal Issue: | 19 | Start page/Pages: | 6837-6847 | Source: | Chemistry of Materials | Abstract: | A systematic study on the effects of heteroarenes on the solid state structure and optoelectronic properties of isoindigo analogues, namely, PBDT-IIG and PBDT-TIIG, used in solution-processed organic field effect transistors (OFETs) and organic photovoltaics (OPVs) is reported. We discover that the optical absorption, frontier orbitals, backbone coplanarity, molecular orientation, solubility, film morphology, charge carrier mobility, and solar cell performance are critically influenced by the heteroarenes in the acceptor subunits. PBDT-IIG exhibits good p-type OFET performance with mobility up to 1.03 × 10-1 cm2 V-1 s-1, whereas PBDT-TIIG displays ambipolar mobilities of μh = 7.06 × 10-2 cm2 V-1 s-1 and μe = 2.81 × 10-4 cm2 V-1 s-1. PBDT-IIG and PBDT-TIIG blended with [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) yield promising power conversion efficiencies (PCEs) of 5.86% and 2.55%, respectively. The excellent mobility of PBDT-IIG can be attributable to the growing fraction of edge-on packing by the interfacial surface treatment. Although PBDT-TIIG could construct a long-range face-on packing alignment to meliorate its photocurrent in OPV applications, the low open-circuit voltage caused by its high-lying HOMO energy level and greater recombination demonstrates the trade-off between light absorption and solar cell performance. Nevertheless, PBDT-TIIG with a PCE of 2.55% is the highest reported PCE to date for the TIIG-based systems. © 2015 American Chemical Society. |
URI: | http://www.scopus.com/inward/record.url?eid=2-s2.0-84944111860&partnerID=MN8TOARS http://scholars.lib.ntu.edu.tw/handle/123456789/392267 |
DOI: | 10.1021/acs.chemmater.5b03197 | SDG/Keyword: | Butyric acid; Economic and social effects; Electromagnetic wave absorption; Light absorption; Molecular orientation; Open circuit voltage; Organic field effect transistors; Photovoltaic effects; Solar cells; Surface treatment; HOMO energy levels; Interfacial surface; Optoelectronic properties; Organic photovoltaics; Power conversion efficiencies; Solar cell performance; Solid-state structures; Solution processed organic field-effect transistors; Field effect transistors |
Appears in Collections: | 化學系 |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.