Improved power conversion efficiency of bulk-heterojunction organic solar cells using a benzothiadiazole–triphenylamine polymer
作者:Takeshi Yasuda、Yuki Shinohara、Takaaki Matsuda、Liyuan Han、Tsutomu Ishi-i
DOI:10.1039/c2jm14671a
日期:——
A comparative study of the properties of bulk-heterojunction organic photovoltaic cells (OPVs) using a benzothiadiazole (BTD)âtriphenylamine (TPA) small molecule and its polymerized molecule (poly(BTD-TPA)) is presented. OPVs using BTD-TPA or poly(BTD-TPA):PC60BM at a 1â:â2 mixing weight ratio were fabricated. The power conversion efficiency (PCE) of the poly(BTD-TPA)-based OPV was twice that of the BTDâTPA-based OPV. The field-effect hole mobility of poly(BTD-TPA) is two orders of magnitude higher than that of BTDâTPA and the absorption peak of poly(BTD-TPA) is at a longer wavelength than that of BTDâTPA. Accordingly, the improved hole mobility and enhanced absorption of AM1.5 solar-simulated light led to a high short-circuit current (Jsc) and PCE in OPVs based on poly(BTD-TPA). Using OPVs with poly(BTD-TPA):PC70BM (1â:â4), the device performance exhibited a Jsc value of 7.45 mA cmâ2, an open-circuit voltage of 0.92 V, a PCE of 2.65%, and incident photon to current conversion efficiencies of around 50% at wavelengths ranging from 360 to 560 nm. The experimental results for the OPVs with BTDâTPA-based materials indicate that the polymer is effective for obtaining high-performance OPVs.
对使用苯并噻二唑 (BTD)-三苯胺 (TPA) 小分子及其聚合分子(聚(BTD-TPA))的体异质结有机光伏电池(OPV)的性能进行了比较研究。使用 BTD-TPA 或聚 (BTD-TPA):PC60BM 以 1::2 的混合重量比制造 OPV。基于聚 (BTD-TPA) 的 OPV 的功率转换效率 (PCE) 是基于 BTD-TPA 的 OPV 的两倍。 Poly(BTD-TPA)的场效应空穴迁移率比BTD-TPA高两个数量级,并且Poly(BTD-TPA)的吸收峰比BTD-TPA的吸收峰波长更长。因此,改进的空穴迁移率和增强的 AM1.5 太阳模拟光吸收导致基于聚 (BTD-TPA) 的 OPV 具有高短路电流 (Jsc) 和 PCE。使用具有聚(BTD-TPA):PC70BM (1-:-4)的OPV,器件性能表现出Jsc值为7.45 mA cm-2,开路电压为0.92 V,PCE为2.65 %,在 360 至 560 nm 波长范围内,入射光子到电流的转换效率约为 50%。使用 BTD-TPA 基材料制备 OPV 的实验结果表明,该聚合物可有效获得高性能 OPV。