Tuning the Absorption, Charge Transport Properties, and Solar Cell Efficiency with the Number of Thienyl Rings in Platinum-Containing Poly(aryleneethynylene)s
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- 作者：Wai-Yeung Wong ; Xing-Zhu Wang ; Ze He ; Kwok-Kwan Chan ; Aleksandra B. Djurii ; Kai-Yin Cheung ; Cho-Tung Yip ; Alan Man-Ching Ng ; Yan Yan Xi ; Chris S. K. Mak ; Wai-Kin Chan
- 刊名：Journal of the American Chemical Society
- 出版年：2007
- 出版时间：November 21, 2007
- 年：2007
- 卷：129
- 期：46
- 页码：14372 - 14380
- 全文大小：378K
- 年卷期：v.129,no.46(November 21, 2007)
- ISSN：1520-5126
文摘
The synthesis, characterization, and photophysics of a series of solution-processable and stronglyvisible-light absorbing platinum(II) polyynes containing bithiazole-oligo(thienyl) rings were presented. Tuningthe polymer solar cell efficiency, as well as optical and charge transport properties, in soluble, low-bandgap PtII-based conjugated poly(heteroaryleneethynylene)s using the number of oligothienyl rings is described.These materials are highly soluble in polar organic solvents due to the presence of solubilizing bithiazolemoieties and show strong absorptions in the solar spectra, rendering them excellent candidates for bulkheterojunction polymer solar cells. Their photovoltaic responses and power conversion efficiencies (PCEs)depend to a large extent on the number of thienyl rings along the main chain, and some of them can beused to fabricate highly efficient solar cells with PCEs of up to 2.7% and a peak external quantum efficiencyto 83% under AM1.5 simulated solar illumination, which is comparable to that of poly(3-hexylthiophene)-based devices fabricated without additional processing (annealing or TiOx layer). The influence of the numberof thienyl rings and the metal group on the performance parameters and optimization of solar cell efficiencywas evaluated and discussed in detail. At the same blend ratio of 1:4, the light-harvesting ability and PCEincrease sharply as the thienyl chain length increases. The present work provides an attractive approachto developing conjugated metallopolymers offering broad solar absorptions and tunable solar cell efficiencyand demonstrates the potential of metalated conjugated polymers for efficient power generation.