An Extremely Narrow-Band-Gap Conjugated Polymer with Heterocyclic Backbone and its Use in Optoelectronic Devices
✍ Scribed by Yangjun Xia; Xianyu Deng; Li Wang; Xianzhen Li; Xuhui Zhu; Yong Cao
- Book ID
- 102492555
- Publisher
- John Wiley and Sons
- Year
- 2006
- Tongue
- English
- Weight
- 173 KB
- Volume
- 27
- Category
- Article
- ISSN
- 1022-1336
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✦ Synopsis
Abstract
Summary: A novel narrow‐band‐gap conjugated polymer with heterocyclic backbone, poly[4,7‐bis(4‐decanyl‐2‐thienyl)‐2′,1′,3^′^‐benzothiadiazole‐thiophene‐2,5‐] (PDDBT, E~g~ = 1.38 eV) was synthesized by a Stille coupling reaction. Prototype bulk heterojunction photovoltaic cells from PDDBT and [6,6]‐phenyl‐C~61~‐butyric acid methyl ester (PCBM) with a ITO/PEDOT:PSS/PDDBT:PCBM(1:3)/Ba/Al device architecture showed power conversion efficiencies up to 0.13% under AM1.5 solar simulator (100 mW · cm^−2^) with an open‐circuit voltage V~oc~ of 0.65 V, a short‐circuit current density J~sc~ of 0.6 mA · cm^−2^, and a photocurrent response up to 880 nm. The electroluminescent device from PDDBT showed a near‐infrared light emission peak at around 830 nm with maximal external quantum efficiency of 0.08% and a turn‐on voltage at 3.5 V.
Normalized PL and EL spectra of PDDBT and photosensitivity of PVCs based on PDDBT/PCBM (1:3) blend. The scheme shows the chemical structure of PDDBT.
magnified imageNormalized PL and EL spectra of PDDBT and photosensitivity of PVCs based on PDDBT/PCBM (1:3) blend. The scheme shows the chemical structure of PDDBT.