| Harvesting energy directly from sunlight using photovoltaic cells is recognized worldwide as an important solution to the growing energy crisis and environmental pollution, organic solar cells have been attracting considerable attention in recent years due to their advantages of low cost, light weight, and potential application in flexible large-area devices. However, poor solubility and low light absorption efficiency of organic photovoltaic materials limit the applications in solar cells. The key point of the paper is to synthesize a series of broad absorption and solution processing organic photovoltaic materials useing of different groups'complementary absorption and research their photovoltaic properties.1 Three novel conjugated polythiophenes (PThBTDmCzn) incorporating separate and content-tunable benzothiadiazole and carbazole moieties have been designed and synthesized, absorption spectral, thermal, electrochemical, and photovoltaic properties of the random copolymers were investigated. Research of The optical properties show that these polymers have a broad absorption spectrum, covering the visible region from 300 to 800 nm. DSC analysis showed that the polymers were readily crystallized, indicating highly ordered intermolecular packing, which is beneficial for efficient charge carrier transport. The preliminary investigation on the photovoltaic devices of the PThBTDmCzn polymers and PCBM gave similar power conversion efficiency of 1.1– 1.2%.2 A zinc phthalocyanine derivative ZnPc-TDA including benzothiadiazole and thiophene moieties have been designed and synthesized. Comparing with zinc phthalocyanine, ZnPc-TDA have a broader absorption spectrum, which covering the visible region from 300 to 800 nm due to the introduction of benzothiadiazole and thiophene moieties. Research the application in solar cells and explore the influence of PCBM content, annealing process and the organic active layer thin-film thickness on the photovoltaic device performance. |
PDF Full Text Request