Department of Chemistry
Platinum(II)–bis(aryleneethynylene) complexes for solution-processible molecular bulk heterojunction solar cells
Four new solution-processible small-molecular platinum(II)-bis( aryleneethynylene) complexes consisting of benzothiadiazole as the electron acceptor and triphenylamine and/ or thiophene as the electron donor were conveniently synthesized and characterized by physicochemical and computational methods, and utilized as the electron-donor materials in the fabrication of solution-processed bulk heterojunction (BHJ) solar cells. The effect of different electron-donor groups in these small molecules on the optoelectronic and photovoltaic properties was also examined. The optical and time-dependent density functional theory studies showed that the incorporation of stronger electron-donor groups significantly enhanced the solarabsorption abilities of the complexes. These molecular complexes can serve as good electron donors for fabricating BHJ devices by blending them with the [6,6]-phenyl-C 71-butyric acid methyl ester (PC 70BM) as the electron acceptor. The best power conversion efficiency of 2.37% was achieved with the open-circuit voltage of 0.83 V, short-circuit current density of 7.10 mAcm -2 and fill factor of 0.40 under illumination of an AM 1.5 solar-cell simulator. The spin-coated thin films showed pchannel field-effect charge transport with hole mobilities of up to 2.4× 10 -4 cm 2V -1 s -1 for these molecules. The present work illuminates the potential of well-defined organometallic complexes in developing light-harvesting small molecules for efficient power generation in organic photovoltaics implementation. © 2012 Wiley-VCH Verlag GmbH&Co. KGaA, Weinheim.
Organic photovoltaics, Organic solar cells, Platinum, Solution processing, Synthetic methods, Voltammetry
Source Publication Title
Chemistry - A European Journal
Dai, Feng-Rong, Hong-Mei Zhan, Qian Liu, Ying-Ying Fu, Jin-Hua Li, Qi-Wei Wang, Zhiyuan Xie, Lixiang Wang, Feng Yan, and Wai-Yeung Wong. "Platinum(II)–bis(aryleneethynylene) complexes for solution-processible molecular bulk heterojunction solar cells." Chemistry - A European Journal 18.5 (2012): 1502-1511.