PMID- 20162652
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20100629
LR  - 20100324
IS  - 1521-3765 (Electronic)
IS  - 0947-6539 (Linking)
VI  - 16
IP  - 12
DP  - 2010 Mar 22
TI  - Synthesis and photovoltaic properties of cyclopentadithiophene-based low-bandgap 
      copolymers that contain electron-withdrawing thiazole derivatives.
PG  - 3743-52
LID - 10.1002/chem.200903064 [doi]
AB  - We have synthesized four types of cyclopentadithiophene (CDT)-based low-bandgap 
      copolymers, 
      poly[4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b']dithiophene-2,6-diyl-alt-(2,2'-bithiazole-5,5'-diyl)] 
      (PehCDT-BT), 
      poly[(4,4-dioctyl-4H-cyclopenta[2,1-b:3,4-b']dithiophene-2,6-diyl)-alt-(2,2'-bithiazole-5,5'-diyl)] 
      (PocCDT-BT), 
      poly[4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b']dithiophene-2,6-diyl-alt-2,5-di(thiophen-2-yl)thiazolo[5,4-d]thiazole-5,5'-diyl] 
      (PehCDT-TZ), and 
      poly[(4,4-dioctyl-4H-cyclopenta[2,1-b:3,4-b']dithiophene-2,6-diyl)-alt-2,5-di(thiophen-2-yl)thiazolo[5,4-d]thiazole-5,5'-diyl] 
      (PocCDT-TZ), for use in photovoltaic applications. The intramolecular 
      charge-transfer interaction between the electron-sufficient CDT unit and 
      electron-deficient bithiazole (BT) or thiazolothiazole (TZ) units in the 
      polymeric backbone induced a low bandgap and broad absorption that covered 300 nm 
      to 700-800 nm. The optical bandgap was measured to be around 1.9 eV for PehCDT-BT 
      and PocCDT-BT, and around 1.8 eV for PehCDT-TZ and PocCDT-TZ. Gel permeation 
      chromatography showed that number-average molecular weights ranged from 8000 to 
      14,000 g mol(-1). Field-effect mobility measurements showed hole mobility of 
      10(-6)-10(-4) cm(2) V(-1) s(-1) for the copolymers. The film morphology of the 
      bulk heterojunction mixtures with [6,6]phenyl-C(61)-butyric acid methyl ester 
      (PCBM) was also examined by atomic force microscopy before and after heat 
      treatment. When the polymers were blended with PCBM, PehCDT-TZ exhibited the best 
      performance with an open circuit voltage of 0.69 V, short-circuit current of 7.14 
      mA cm(-2), and power conversion efficiency of 2.23 % under air mass (AM) 1.5 
      global (1.5 G) illumination conditions (100 mW cm(-2)).
FAU - Jung, In Hwan
AU  - Jung IH
AD  - Department of Chemistry, Korea Advanced Institute of Science and Technology, 
      Daejeon, 305-701, Republic of Korea.
FAU - Yu, Jinyoung
AU  - Yu J
FAU - Jeong, Eunjae
AU  - Jeong E
FAU - Kim, Jinseck
AU  - Kim J
FAU - Kwon, Sooncheol
AU  - Kwon S
FAU - Kong, Hoyoul
AU  - Kong H
FAU - Lee, Kwanghee
AU  - Lee K
FAU - Woo, Han Young
AU  - Woo HY
FAU - Shim, Hong-Ku
AU  - Shim HK
LA  - eng
PT  - Journal Article
PL  - Germany
TA  - Chemistry
JT  - Chemistry (Weinheim an der Bergstrasse, Germany)
JID - 9513783
EDAT- 2010/02/18 06:00
MHDA- 2010/02/18 06:01
CRDT- 2010/02/18 06:00
PHST- 2010/02/18 06:00 [entrez]
PHST- 2010/02/18 06:00 [pubmed]
PHST- 2010/02/18 06:01 [medline]
AID - 10.1002/chem.200903064 [doi]
PST - ppublish
SO  - Chemistry. 2010 Mar 22;16(12):3743-52. doi: 10.1002/chem.200903064.