Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India.
J Phys Chem B. 2010 Mar 11;114(9):3095-103. doi: 10.1021/jp909183x.
The diketopyrrolopyrrole-based copolymers PDPP-BBT and TDPP-BBT were synthesized and used as a donor for bulk heterojunction photovoltaic devices. The photophysical properties of these polymers showed absorption in the range 500-600 nm with a maximum peak around 563 nm, while TDPP-BBT showed broadband absorption in the range 620-800 nm with a peak around 656 nm. The power conversion efficiencies (PCE) of the polymer solar cells based on these copolymers and [6,6]-phenyl C61 butyric acid methyl ester (PCBM) were 0.68% (as cast PDPP-BBT:PCBM), 1.51% (annealed PDPP-BBT:PCBM), 1.57% (as cast TDPP-BBT:PCBM), and 2.78% (annealed TDPP-BBT:PCBM), under illumination of AM 1.5 (100 mW/cm(2)). The higher PCE for TDPP-BBT-based polymer solar cells has been attributed to the low band gap of this copolymer as compared to PDPP-BBT, which increases the numbers of photogenerated excitons and corresponding photocurrent of the device. These results indicate that PDPP-BBT and TDPP-BBT act as excellent electron donors for bulk heterojunction devices.
基于二酮吡咯并吡咯的共聚物 PDPP-BBT 和 TDPP-BBT 被合成并用作体异质结光伏器件的供体。这些聚合物的光物理性质表现出在 500-600nm 范围内的吸收，最大峰值约为 563nm，而 TDPP-BBT 在 620-800nm 范围内表现出宽带吸收，峰值约为 656nm。基于这些共聚物和[6,6]-苯基 C61 丁酸甲酯（PCBM）的聚合物太阳能电池的功率转换效率（PCE）分别为 0.68%（未退火 PDPP-BBT：PCBM）、1.51%（退火 PDPP-BBT：PCBM）、1.57%（未退火 TDPP-BBT：PCBM）和 2.78%（退火 TDPP-BBT：PCBM），在 AM 1.5（100 mW/cm²）光照下。与 PDPP-BBT 相比，TDPP-BBT 共聚物的低带隙导致基于 TDPP-BBT 的聚合物太阳能电池具有更高的 PCE，这增加了器件的光生激子数量和相应的光电流。这些结果表明 PDPP-BBT 和 TDPP-BBT 可作为体异质结器件的优异电子供体。
