Showing papers by "Chang He published in 2007"
TL;DR: A solution processible organic conjugated molecule 2-[2,6-bis-(2-{4-[2-(diphenylaminophenyl)vinyl]phenyl}vinyl)pyran-4-ylidene]malononitrile (TPA−DCM−TPA) was designed and synthesized for application in organic solar cells (OSCs) as mentioned in this paper.
Abstract: A solution processible organic conjugated molecule 2-[2,6-bis-(2-{4-[2-(4-diphenylaminophenyl)vinyl]phenyl}vinyl)pyran-4-ylidene]malononitrile (TPA−DCM−TPA) was designed and synthesized for application in organic solar cells (OSCs). The molecule consists of two electron-rich triphenylamine moieties and one electron-deficient 2-pyran-4-ylidenemalononitrile unit linked with conjugated bridges. The optical and electrochemical properties, the light-induced electron spin resonance (LESR), and the electronic ground state configuration of the compound were characterized. TPA−DCM−TPA film showed a broad absorption band covering from 350 to 650 nm. The bulk-heterojunction OSCs with the device structure of ITO/PEDOT:PSS/TPA−DCM−TPA:PCBM/LiF/Al or Ba/Al were fabricated, in which TPA−DCM−TPA was used as donor and PCBM as acceptor material. The open-circuit voltage, short-circuit current, and power-conversion efficiency of the optimized OSC with Ba/Al as cathode, TPA−DCM−TPA:PCBM = 1:3 (w/w), and ca. 85 nm thickness o...
119 citations
TL;DR: In this paper, a series of alternating copolymers of electron-rich arylamine and electron-deficient 2,1,3-benzothiadiazole (BT), PV-BT, DP-BT and TP-BT were synthesized by Heck coupling reaction.
Abstract: A series of alternating copolymers of electron-rich arylamine and electron-deficient 2,1,3-benzothiadiazole (BT), PV-BT, DP-BT, and TP-BT, were synthesized by Heck coupling reaction. UV–vis absorption and fluorescence spectra show that the copolymerization of electron-rich diphenylamine (DP), triphenylamine (TP), MEH-PV (PV), and electron-deficient BT results in low-bandgap conjugated polymers. Within the three copolymers of PV-BT, DP-BT, and TP-BT, TP-BT possesses the highest hole mobility of 4.68 × 10− 5 cm2/V, as determined from the space charge limited current (SCLC) model. The bulk heterojunction-typed polymer solar cells (PSCs) were fabricated with the blend of the copolymers and PCBM as the photosensitive layer. The power conversion efficiencies (PCE) of the PSCs based on PV-BT, DP-BT, and TP-BT reached 0.26%, 0.39%, and 0.52%, respectively, under the illumination of AM 1.5, 100 mW/cm2. The results indicate that TP-BT is a promising photovoltaic polymer for PSCs. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 3861–3871, 2007
69 citations