High-Crystalline Medium-Band-Gap Polymers Consisting of Benzodithiophene and Benzotriazole Derivatives for Organic Photovoltaic Cells

Cited 47 time in webofscience Cited 0 time in scopus
  • Hit : 139
  • Download : 211
Two semiconducting conjugated polymers were synthesized via Stille polymerization. The structures combined unsubstituted or (triisopropylsilyl)ethynyl (TIPS)-substituted 2,6-bis(trimethylstannyl)benzo[1,2-b':4.5-bldithiophene (BDT# as a donor unit and benzotriazole with a symmetrically branched alkyl side chain #DTBTz) as an acceptor unit. We investigated the effects of the different BDT moieties on the optical, electrochemical, and photovoltaic properties of the polymers and the film crystallinities and carrier mobilities. The optical-band-gap energies were measured to be 1.97 and 1.95 eV for PBDT-DTBTz and PTIPSBDT-DTBTz, respectively. Bulk heterojunction photovoltaic devices were fabricated and power conversion efficiencies of 5.5% and 2.9% were found for the PTIPSBDT-DTBTz- and PBDT-DTBTz-based devices, respectively. This difference was explained by the more optimal morphology and higher carrier mobility in the PTIPSBDT-DTBTz-based devices. This work demonstrates that, under the appropriate processing conditions, TIPS groups can change the molecular ordering and lower the highest occupied molecular orbital level, providing the potential for improved solar cell performance.
Publisher
AMER CHEMICAL SOC
Issue Date
2013-12
Language
English
Article Type
Article
Keywords

OPEN-CIRCUIT VOLTAGE; SOLAR-CELLS; SIDE-CHAINS; SEMICONDUCTING POLYMERS; CORRELATION-ENERGY; RATIONAL DESIGN; PERFORMANCE; COPOLYMERS; DENSITY; TRANSISTORS

Citation

ACS APPLIED MATERIALS INTERFACES, v.5, no.24, pp.12820 - 12831

ISSN
1944-8244
DOI
10.1021/am401926h
URI
http://hdl.handle.net/10203/187119
Appears in Collection
CBE-Journal Papers(저널논문)
Files in This Item
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 47 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0