TPD ‐ and  DPP ‐based Small Molecule Donors Containing Pyridine End Groups for Organic Photovoltaic Cells | Zendy

Kim Jungwoon | Zendy; Eun Song Chang | Zendy; Lee Sang Kyu | Zendy; Lim Eunhee | Zendy

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TPD ‐ and DPP ‐based Small Molecule Donors Containing Pyridine End Groups for Organic Photovoltaic Cells

Author(s) -

Kim Jungwoon,

Eun Song Chang,

Lee Sang Kyu,

Lim Eunhee

Publication year - 2016

Publication title -

bulletin of the korean chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.237

H-Index - 59

ISSN - 1229-5949

DOI - 10.1002/bkcs.10647

Subject(s) - stille reaction , pyridine , molecule , small molecule , pyrrole , band gap , chemistry , photochemistry , energy conversion efficiency , electrochemistry , suzuki reaction , materials science , organic chemistry , electrode , catalysis , palladium , optoelectronics , biochemistry

We synthesized two new thieno[3,4‐ c ]pyrrole‐4,6‐dione ( TPD )‐ and diketopyrrolopyrrole ( DPP )‐based small molecules having pyridine end groups, TPDTPy and DPPTPy , using the Stille and Suzuki coupling reactions, respectively. The optical, electrochemical, and photovoltaic properties of these small molecules depended on the introduced electron‐accepting units of TPD and DPP . DPPTPy exhibited a relatively low‐energy bandgap ( E g ) of 1.82 eV compared to TPDTPy (2.22 eV ) because of the stronger electron‐withdrawing ability of DPP compared to TPD . Organic photovoltaic cells with the inverted ITO / ZnO /small molecule:(6,6)‐phenyl‐ C 71 ‐butyric acid methyl ester/ MoO 3 /Ag structure were fabricated. The DPPTPy ‐based device showed a relatively high power conversion efficiency of 0.62% compared to TPDTPy (0.16%), mainly because of the red‐shifted UV absorption, lower E g , and the higher short‐circuit current of DPPTPy .

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