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Enhanced performance of perovskite solar cells by the incorporation of the luminescent small molecule DBP: perovskite absorption spectrum modification and interface engineering†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2019-04-09 00:00:00 , DOI: 10.1039/c9tc00064j Saisai Ding 1, 2, 3, 4, 5 , Shiqi Li 1, 2, 3, 4, 5 , Qinjun Sun 1, 2, 3, 4, 5 , Yukun Wu 1, 2, 3, 4, 5 , Yifan Liu 1, 2, 3, 4, 5 , Zhanfeng Li 1, 2, 3, 4, 5 , Yanxia Cui 1, 2, 3, 4, 5 , Hua Wang 3, 5, 6, 7 , Yuying Hao 1, 2, 3, 4, 5 , Yucheng Wu 3, 5, 6, 7
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2019-04-09 00:00:00 , DOI: 10.1039/c9tc00064j Saisai Ding 1, 2, 3, 4, 5 , Shiqi Li 1, 2, 3, 4, 5 , Qinjun Sun 1, 2, 3, 4, 5 , Yukun Wu 1, 2, 3, 4, 5 , Yifan Liu 1, 2, 3, 4, 5 , Zhanfeng Li 1, 2, 3, 4, 5 , Yanxia Cui 1, 2, 3, 4, 5 , Hua Wang 3, 5, 6, 7 , Yuying Hao 1, 2, 3, 4, 5 , Yucheng Wu 3, 5, 6, 7
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The interfacial defect states between the active layer and the charge transport layer in perovskite solar cells (PSCs) are one of the main channels of energy loss, which can result in carrier recombination loss and then limit the efficiency and stability of devices. In this study, the luminescent organic small molecule material tetraphenyldibenzoperiflanthene (DBP) was inserted between CH3NH3PbI3 perovskite and the electron transport layer PCBM as an interface modification layer. As a result, DBP-based PSCs attained the average power conversion efficiency (PCE) of 15.61%, obviously higher than 14.26% of the reference device. The enhanced PCE was attributed to the multifunctional synergistic effect of DBP. DBP not only behaves as an efficient interface modification layer to passivate the perovskite defects and improve the energy level alignment, thereby reducing carrier recombination losses at the interface, but also plays a role as a CH3NH3PbI3 absorption spectrum modification layer by Föster energy transfer and thus enhances the light absorption of the CH3NH3PbI3 layer in the near-infrared region. Moreover, the hydrophobic and passivation effects of DBP improve the air-, thermal- and photo-stability of the PSCs. This study demonstrates the use of multifunctional organic luminescent molecules as an interfacial engineering material is a highly useful and facile method for improving the performance of planar perovskite solar cells.
中文翻译：
通过掺入发光小分子DBP增强钙钛矿太阳能电池的性能：钙钛矿吸收光谱改性和界面工程†
钙钛矿太阳能电池（PSC）的有源层和电荷传输层之间的界面缺陷状态是能量损失的主要途径之一，它可能导致载流子复合损失，进而限制了器件的效率和稳定性。在这项研究中，将发光有机小分子材料四苯基二苯并perflanthene （DBP）插入CH 3 NH 3 PbI 3之间钙钛矿和电子传输层PCBM作为界面改性层。结果，基于DBP的PSC的平均功率转换效率（PCE）为15.61％，明显高于参考设备的14.26％。增强的PCE归因于DBP的多功能协同作用。DBP不仅起到钝化钙钛矿缺陷和改善能级对准的有效界面改性层的作用，从而减少了界面处的载流子复合损失，而且还充当了Föster的CH 3 NH 3 PbI 3吸收光谱改性层的作用。能量转移，从而增强了CH 3 NH 3 PbI 3的光吸收在近红外区域。此外，DBP的疏水性和钝化效果可改善PSC的空气稳定性，热稳定性和光稳定性。这项研究表明，使用多功能有机发光分子作为界面工程材料是改善平面钙钛矿太阳能电池性能的非常有用且简便的方法。
更新日期：2019-04-09
中文翻译：
通过掺入发光小分子DBP增强钙钛矿太阳能电池的性能：钙钛矿吸收光谱改性和界面工程†
钙钛矿太阳能电池（PSC）的有源层和电荷传输层之间的界面缺陷状态是能量损失的主要途径之一，它可能导致载流子复合损失，进而限制了器件的效率和稳定性。在这项研究中，将发光有机小分子材料四苯基二苯并perflanthene （DBP）插入CH 3 NH 3 PbI 3之间钙钛矿和电子传输层PCBM作为界面改性层。结果，基于DBP的PSC的平均功率转换效率（PCE）为15.61％，明显高于参考设备的14.26％。增强的PCE归因于DBP的多功能协同作用。DBP不仅起到钝化钙钛矿缺陷和改善能级对准的有效界面改性层的作用，从而减少了界面处的载流子复合损失，而且还充当了Föster的CH 3 NH 3 PbI 3吸收光谱改性层的作用。能量转移，从而增强了CH 3 NH 3 PbI 3的光吸收在近红外区域。此外，DBP的疏水性和钝化效果可改善PSC的空气稳定性，热稳定性和光稳定性。这项研究表明，使用多功能有机发光分子作为界面工程材料是改善平面钙钛矿太阳能电池性能的非常有用且简便的方法。
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