Chen Guo, Ling Zhitian, Wei Bin, Zhang Jianhua, Hong Ziruo, Sasabe Hisahiro, Kido Junji
Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, Shanghai, China.
Department of Organic Device Engineering, Graduate School of Engineering, Research Center for Organic Electronics, Yamagata University, Yonezawa, Japan.
Front Chem. 2018 Sep 11;6:412. doi: 10.3389/fchem.2018.00412. eCollection 2018.
Squaraine dyes have shown promising properties for high performance organic solar cells owing to their advantages of intense absorption and high absorption coefficients in the visible and near-infrared (NIR) regions. In this work, to directly compare the photovoltaic performance of solution- and vacuum-processed small-molecule bulk heterojunction (SMBHJ) solar cells, we employed a squaraine small molecular dye, 2,4-bis[4-(N,N-diisobutylamino)-2,6-dihydroxyphenyl] squaraine (DIBSQ), as an electron donor combined with fullerene acceptors to fabricate SMBHJ cells either from solution or vacuum deposition process. The solution-processed SMBHJ cell possesses a power conversion efficiency (PCE) of ~4.3%, while the vacuum-processed cell provides a PCE of ~6.3%. Comparison of the device performance shows that the vacuum-processed SMBHJ cells possess higher short-circuit current density, fill factor and thus higher PCE than the solution-processed devices, which should be assigned to more efficient charge transport and charge extraction in the vacuum-processed SMBHJ cells. However, solution-processed SMBHJ cells demonstrate more pronounced temperature-dependent device performance and higher device stability. This study indicates the great potential of DIBSQ in photovoltaic application via both of solution and vacuum processing techniques.
由于方酸染料在可见光和近红外（NIR）区域具有强烈吸收和高吸收系数的优点，其在高性能有机太阳能电池方面展现出了良好的性能。在本工作中，为了直接比较溶液法和真空法制备的小分子体异质结（SMBHJ）太阳能电池的光伏性能，我们采用了一种方酸小分子染料2,4-双[4-(N,N-二异丁基氨基)-2,6-二羟基苯基]方酸（DIBSQ）作为电子供体，与富勒烯受体结合，通过溶液法或真空沉积法制备SMBHJ电池。溶液法制备的SMBHJ电池的功率转换效率（PCE）约为4.3%，而真空法制备的电池的PCE约为6.3%。器件性能比较表明，与溶液法制备的器件相比，真空法制备的SMBHJ电池具有更高的短路电流密度、填充因子，因此具有更高的PCE，这应归因于真空法制备的SMBHJ电池中更有效的电荷传输和电荷提取。然而，溶液法制备的SMBHJ电池表现出更明显的温度依赖性器件性能和更高的器件稳定性。本研究表明DIBSQ通过溶液法和真空法加工技术在光伏应用中具有巨大潜力。
