量子点敏化太阳电池光阳极研究进展

在量子点敏化太阳电池的性能研究中,光阳极薄膜的优化一直是研究的重点。除了传统的TiO_2纳米颗粒,通过一些简单实验制备出的纳米管、纳米线阵列,一维核壳纳米结构也被广泛的应用于光阳极中。形貌易于控制的ZnO因与TiO_2具有相似的能带结构和物理性质,又兼具高的电子迁移率而成为比较理想替代物。一维ZnO及其核壳结构半导体材料的制备及性能研究表明,其具有良好的导电性,电荷分离传输效率高,光俘获性能好等优点,已成为量子点敏化太阳电池光阳极研究的重要方向。     

量子点敏化太阳电池对电极研究进展

对电极在量子点太阳能电池中具有重要的作用,本文主要介绍了铂、金属硫化物、金属硒化物和复合材料对电极的发展现状。复合材料对电极由于良好的导电和催化性能,且具有较好的稳定性,已经成为获得具有高光电效率的量子点敏化太阳能电池的重要研究方向。     

Synthesis of conjugated polymers with broad absorption bands and photovoltaic properties as bulk heterojuction solar cells

Two new broad absorbing alternating copolymers, poly[1-(2,6-diisopropylphenyl)-2,5-bis(2-thienyl)pyrrole-alt-4,7-bis(3-octyl-2-thienyl)benzothiadiazole] (PTPTTBT-P1) and poly[1-(p-octylphenyl)-2,5-bis(2-thienyl)pyrrole-alt-4,7-bis(3-octyl-2-thienyl)benzothiadiazole] (PTPTTBT-P2), were prepared via Suzuki polycondensation with high yields. The two polymers were found to show characteristic absorption in the visible region of the solar spectrum. Interestingly the absorption of PTPTTBT-P1 was found to cover the visible region from 350 to 650 nm with the broad and flat absorption maximum from 440 to 510 nm in film and the absorption of PTPTTBT-P2 was found to cover the visible region from 350 to 950 nm with the relatively distinct absorption maxima at 425 and 522 nm and very weak absorption maximum at 832 nm in film. The electrochemical band gaps of the polymers were calculated to be 1.88 eV and 1.87 eV, respectively, while the optical band gaps of the polymers were calculated to be 1.94 eV and 1.87 eV, respectively. The photovoltaic properties of polymers were investigated with bulk heterojunction (BHJ) solar cells fabricated in ITO/PEDOT:PSS/polymer:PC₇₀BM(1:5 wt%)/TiOx/Al configurations. The maximum power conversion efficiency (PCE) of the solar cell composed of PTPTTBT-P1:PC₇₀BM as an active layer was 1.57% with current density (J_sc) of 8.17 mA/cm², open circuit voltage (V_oc) of 0.52 V and fill factor (FF) of 36%.