Naphtho[1,2-b:5,6-b′]dithiophene-based copolymers for applications to polymer solar cells

Chinna Bathula, Chang Eun Song, Sachin Badgujar, Seong Jin Hong, Song Yi Park, Won Suk Shin, Jong Cheol Lee, Shinuk Cho, Taek Ahn, Sang Jin Moon, Sang Kyu Lee

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Two naphtho[1,2-b:5,6-b′]dithiophene-based copolymers, poly[4,9-bis(2-ethylhexyloxy)naphtho[1,2-b:5,6-b′]dithiophene-2, 7-diyl-alt-[4,6-{(1-thieno[3,4-b]thiophen-2-yl)-2-ethylhexan-1-one}] (P1) and poly[4,9-bis(2-ethylhexyloxy)naphtho[1,2-b:5,6-b′]dithiophene-2, 7-diyl-alt-[4,6-{(1-(3-fluorothieno[3,4-b]thiophen)-2-yl)-2-ethylhexan-1-one}] (P2), were designed and synthesized for use in polymer solar cells (PSCs). We systematically investigated the synthesis, thermal stability, optical and electrochemical properties, field-effect carrier mobilities, and photovoltaic characteristics of these polymers. The field-effect mobilities of P1 and P2 were determined to be 5.8 × 10-4 and 1.2 × 10-3 cm2 V-1 s-1, respectively. Among the naphtho[1,2-b:5,6-b′]dithiophene-based copolymers studied here, P2 showed the best photovoltaic performance, with an open-circuit voltage (Voc) of 0.71 V, a short-circuit current density (Jsc) of 13.52 mA cm -2, a fill factor (FF) of 0.51, and a power conversion efficiency of 4.88% under AM 1.5 irradiation (100 mW cm-2).

Original languageEnglish
Pages (from-to)2132-2139
Number of pages8
JournalPolymer Chemistry
Volume4
Issue number6
DOIs
StatePublished - 21 Mar 2013

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