Browsing by Author "Lin, Wei-Cheng"

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Low-toxic cycloplatinated polymer dots with rational design of acceptor comonomers for enhanced photocatalytic efficiency and stability
(2020-07-05)
Chang, Chih-Li
;
Lin, Wei-Cheng
;
Jia, Chuan-Yu
;
Ting, Li-Yu
;
Jayakumar, Jayachandran
By mimicking nature photosynthesis, a library of cycloplatinated polymer dots (Pdots) and pristine Pdots are presented and investigated the importance of selecting acceptor comonomers. A clear design strategy for the selection of acceptor comonomers of Pdots to achieve environmental-friendly, high efficiency, and long stability of photocatalytic reaction can be understood. The active PFTBTA-PtPy Pdots provide the excellent hydrogen evolution rates up to 7.34 +/- 0.82 mmol h(-1) g(-1) under a methanol-free solution and visible-light-driven system. MTT assay experiments confirm the use of the cycloplatinated Pdots as photocatalysts can minimize the toxicity, relative to the conventional approach that directly adding Pt into a solution system. Furthermore, the Pdots can be reactivated for hydrogen generation by the recycling process. The result proves that the use of cycloplatinated Pdots can not only enhance the HER efficiency and stability but also reduce the toxicity.
Self-Assembled and Cross-Linked Fullerene Interlayer on Titanium Oxide for Highly Efficient Inverted Polymer Solar Cells
(2011-03-22)
Cheng, Yen-Ju
;
Cao, Fong-Yi
;
Lin, Wei-Cheng
;
Chen, Chiu-Hsiang
;
Hsieh, Chao-Hsiang
We have successfully designed and synthesized two oxetane-functionalized fullerene derivatives, [6,6]-phenyl-C(61)-butyric oxetane ester (PCBO) and [6,6]-phenyl-C(63)-butyric oxetane dendron ester (PCBOD). We demonstrated that the oxetane functionality with neutral nature can anchor onto the TiO(x) surface via cationic ring-opening reaction under thermal and UV treatment, as evidenced by contact angle measurement and X-ray photoelectron spectroscopy. The self-assembly of PCBO, functionalized with one oxetane group, on the TiO(x) surface forms an adhesive monolayer with intimate contact. Inverted bulk-heterojunction device B [ITO/TiO(x)/SA-PCBO/P3HT:PCBM (1:1 w/w)/MoO(3)/Ag, where ITO is indium tin oxide, SA is self-assembled, P3HT is poly(3-hexylthiophene), and PCBM is [6,6]-phenyl-C(61)-butyric acid methyl ester] with this self-assembled PCB (SA-PCBO) modifier showed an impressive power conversion efficiency (PCE) of 4.1%, which outperforms the reference device A (PCE = 3.6%) without this monolayer [ITO/TiO(x)/P3HT:PCBM (1:1 w/w)/MoO(3)/Ag]. This SA-PCBO modifier exerts multipositive effects on the interface, including improvement of exciton dissociation efficiency, reduction of charge recombination, decrease of the interface contact resistance, and passivation of the surface electron traps at the interface of TiO(x). Furthermore, PCBOD, containing two oxetane groups, is capable of self-assembling on the TiO(x) surface and simultaneously undergoing cross-linking, generating a dense, robust, and pinhole-free multimolecular interlayer to further strengthen the interface characteristics. Device C [ITO/TiO(x)/C-PCBOD/P3HT:PCBM(1:1, in wt%)/MoO(3)/Ag] incorporating this cross-linked PCBOD (C-PCBOD) interlayer delivered the highest PCE of 4.5% which represents 26% enhancement over device A. This simple and easy strategy smartly integrates the advantages of self-assembly and cross-linking in a single fullerene-based molecule, showing promise in producing highly efficient inverted PSCs.