Zhou Suyuan, Zhu Tao, Zheng Luyao, Zhang Dong, Xu Wenzhan, Liu Lei, Cheng Gang, Zheng Jie, Gong Xiong
Department of Polymer Engineering, The University of Akron Akron OH 44325 USA
Department of Chemical and Biomedical Engineering, The University of Akron Akron OH 44325 USA
RSC Adv. 2019 Sep 25;9(52):30317-30324. doi: 10.1039/c9ra04907j. eCollection 2019 Sep 23.
Perovskite solar cells have been rapidly developed in the past ten years. It was demonstrated that the interfacial layer plays an important role in device performance of perovskite solar cells. In this study, we report utilization of a photoinitiation-crosslinked zwitterionic polymer, namely dextran with carboxybetaine modified by methacrylate (Dex-CB-MA), as an interfacial layer to improve the film morphology of the CHNHPbI photoactive layer and the interfacial contact between the poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) hole extraction layer and CHNHPbI photoactive layer. It is found that the Dex-CB-MA thin layer forms a better band alignment between the PEDOT:PSS hole extraction layer and CHNHPbI photoactive layer, and improves the crystallization of the CHNHPbI photoactive layer, resulting in efficient charge carrier transport. As a result, perovskite solar cells with the PEDOT:PSS/Dex-CB-MA hole extraction layer exhibit more than 30% enhancement in efficiency and dramatically boosted stability as compared with that with the PEDOT:PSS hole extraction layer. Our studies provide an effective and facile way to fabricate stable perovskite solar cells with high power conversion efficiency.
在过去十年中，钙钛矿太阳能电池得到了迅速发展。已证明界面层在钙钛矿太阳能电池的器件性能中起着重要作用。在本研究中，我们报道了利用一种光引发交联的两性离子聚合物，即甲基丙烯酸酯修饰的羧基甜菜碱葡聚糖（Dex-CB-MA）作为界面层，以改善CHNHPbI光活性层的薄膜形态以及聚（3,4-亚乙基二氧噻吩）-聚（苯乙烯磺酸盐）（PEDOT:PSS）空穴提取层与CHNHPbI光活性层之间的界面接触。发现Dex-CB-MA薄层在PEDOT:PSS空穴提取层和CHNHPbI光活性层之间形成了更好的能带排列，并改善了CHNHPbI光活性层的结晶，从而实现了有效的电荷载流子传输。结果，与具有PEDOT:PSS空穴提取层的钙钛矿太阳能电池相比，具有PEDOT:PSS/Dex-CB-MA空穴提取层的钙钛矿太阳能电池效率提高了30%以上，稳定性也显著提高。我们的研究提供了一种有效且简便的方法来制备具有高功率转换效率的稳定钙钛矿太阳能电池。
