Polymer solar cells based on very narrow-bandgap polyplatinynes with photocurrents extended into the near-infrared region
作者:Xing-Zhu Wang、Wai-Yeung Wong、Kai-Yin Cheung、Man-Kin Fung、Aleksandra B. Djurišić、Wai-Kin Chan
DOI:10.1039/b803467b
日期:——
The synthesis, characterization and photophysics of some solution-processable intensely coloured polyplatinynes functionalized with the thienopyrazine–thiophene hybrid spacer and their model molecular complexes are described. These metallated polymers possess extremely low bandgaps of 1.47–1.50 eV, which extend towards the near-infrared (NIR) range of the solar spectrum, and represent the lowest optical bandgaps ever reported for metallopolyynes in the literature. Both polymers can be used to fabricate efficient solar cells with power conversion efficiencies (PCEs) of up to 0.63% under air mass (AM1.5) simulated solar illumination, and the possibility of covering the 600–900 nm solar-radiation range to harvest photocurrent has been demonstrated. The influence of the thienyl core as well as its substituent group, on the optical and photovoltaic behavior of these metallopolymers was investigated in detail. The power dependencies of the solar cell parameters (including the short-circuit current density, open-circuit voltage, fill-factor and PCE) were also studied. The present work offers an attractive avenue towards conjugated materials with broad solar absorptions and demonstrates the potential of metallopolyynes for both visible and NIR light power generation.
本文介绍了一些可溶液加工的、具有噻吩吡嗪-噻吩杂化间隔物功能的浓色聚铂炔及其模型分子复合物的合成、表征和光物理。这些金属化聚合物的带隙极低,仅为 1.47-1.50 eV,可延伸至太阳光谱的近红外(NIR)范围,是迄今为止文献中报道的金属多炔的最低光带隙。这两种聚合物都可用于制造高效太阳能电池,在空气质量(AM1.5)模拟太阳光照射下,其功率转换效率(PCE)可高达 0.63%,并证明了覆盖 600-900 纳米太阳辐射范围以收集光电流的可能性。我们还详细研究了噻吩基核及其取代基对这些金属聚合物的光学和光伏性能的影响。此外,还研究了太阳能电池参数的功率依赖性(包括短路电流密度、开路电压、填充因子和 PCE)。本研究为开发具有广泛太阳能吸收能力的共轭材料提供了一条极具吸引力的途径,并证明了金属多聚物在可见光和近红外光发电方面的潜力。