| Summary: | 碩士 === 國立交通大學 === 材料科學與工程學系 === 99 === In this thesis, a series of donor-acceptor (D–A) conjugated polymers,
PBTTPDs, containing electron-withdrawing thieno[3,4-c]pyrrole-4,6-dione
(TPD) and electron-donating bi(alkyl)thiophene units were synthesized. We also
prepared two TPD based low band-gap polymers, PCPDTTPD and PDTSTPD,
conatining electron-donating cyclopenta[2,1-b;3,4-b′]dithiophene (CPDT) and
dithieno[3,2-b:2′,3′-d]silole (DTS) units.
The PBTTPD based polymers exhibit high crystalline characteristics,
low-lying HOMO energy level, and excellent thermal properties. Bulk
heterojunction (BHJ) photovoltaic devices incorporating these polymers/
[6,6]-phenyl-C61-butyric acid methyl ester (PCBM) blend displayed good
photovoltaic properties. Especially, the PBTTPD1 based device displayed a high
power conversion efficiency (PCE) of 4.7%. Moreover, both of PCPDTTPD and
PDTSTPD exhibit low band-gap properties (1.74 and 1.69 eV, respectively) and
excellent thermal properties. BHJ photovoltaic devices incorporating
PCPDTTPD/[6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) and
PDTSTPD/PC71BM blends displayed PCEs of 1.0% and 1.6%, respectively.
Furthermore, when incorporating small amount of additives into these blends,
their PCEs of devices were enhanced to 3.1% and 2.7%, individually, because of
their smoother and more homogeneous morphology of the blend.
|
|---|
