Organic Solar Cells with Open Circuit Voltage over 1.25 V Employing Tetraphenyldibenzoperiflanthene as the Acceptor
Organic Solar Cells with Open Circuit Voltage over 1.25 V Employing Tetraphenyldibenzoperiflanthene as the Acceptor
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DOI：
10.1021/acs.jpcc.6b06302
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发表时间：
2016-09-01
影响因子：
3.7
通讯作者：
Thompson, Mark E.
中科院分区：
文献类型：
--
作者：
Bartynski, Andrew N.;Grob, Stefan;Thompson, Mark E.
制备了以α-六茂铁(6T)为供体、四苯基二苯并杂菲(DBP)为受体的有机光伏器件，并与以DBP为供体、C-60为受体的有机光伏器件进行了比较。与6T/DBP器件相比，6T/DBP器件的开路电压显著更高，为1.27V。对于DBP/C-60，0.86V，这是由于形成了更高的能量电荷转移态。6T/DBP器件的短路电流为3.9 mA/cm(2)，开路电压为1.27 V，填充因数为0.55，功率转换效率为2.8%。原子力显微镜研究表明，6T在铟锡氧化物表面形成织构薄膜，随后沉积的DBP填充在表面。光学建模提供了对理想的有源层和传输层厚度的洞察。对于相当大的层厚度组合的工艺窗口，实现了接近3%的功率转换效率。高开路电压和650 nm波长的吸收使这种材料组合对串联器件特别有吸引力。
Organic photovoltaic devices utilizing alpha-sexithiophene (6T) as a donor and tettaphenyldibenzoperiflanthene (DBP), as an acceptor were fabricated and compared to devices utilizing DBP as a donor and C-60 as, an acceptor. The 6T/DBP devices exhibit substantially higher open circuit voltage, 1.27 V compared to. 0.86 V for DBP/C-60, as a consequence of the higher energy charge transfer state formed. The 6T/DBP devices yield short-circuit current of 3.9 mA/cm(2), open-circuit voltage of 1.27 V, and fill factor of 0.55, resulting in a power conversion efficiency of 2.8%. Atomic force microscopy studies show that 6T forms textured films on indium-tin oxide, and subsequent deposition of DBP infills the surface. Optical modeling provides insight into the ideal active layer and transport layer thicknesses. A power conversion efficiency of close to 3% is achieved for a fairly large process window of layer thickness combinations. The high open-circuit voltage in conjunction with absorption out to a wavelength of 650 nm make this material combination especially attractive for tandem devices.