Premium
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 .