Chen Tingting, He Rui, Zhang Fan, Hao Xia, Xuan Zhipeng, Wang Yunfan, Wang Wenwu, Zhao Dewei, Zhang Jingquan, Wu Lili
College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China.
Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China.
Nanomaterials (Basel). 2021 Mar 16;11(3):750. doi: 10.3390/nano11030750.
Perovskite solar cells have exhibited astonishing photoelectric conversion efficiency and have shown a promising future owing to the tunable content and outstanding optoelectrical property of hybrid perovskite. However, the devices with planar architecture still suffer from huge loss and severe hysteresis effect. In this research, Guanidine hydrobromide (GABr) post-treatment is carried out to enhance the performance of MAPbI n-i-p planar perovskite solar cells. The detailed characterization of perovskite suggests that GABr post-treatment results in a smoother absorber layer, an obvious reduction of trap states and optimized energy level alignment. By utilizing GABr post-treatment, the loss is reduced, and the hysteresis effect is alleviated effectively in MAPbI solar cells. As a result, solar cells based on glass substrate with efficiency exceeding 20%, of 1.13 V and significantly mitigated hysteresis are fabricated successfully. Significantly, we also demonstrate the effectiveness of GABr post-treatment in flexible device, whose efficiency is enhanced from 15.77% to 17.57% mainly due to the elimination of loss.
钙钛矿太阳能电池由于混合钙钛矿的可调节成分和出色的光电性能，展现出了惊人的光电转换效率，并显示出了广阔的前景。然而，具有平面结构的器件仍然存在巨大的损失和严重的滞后效应。在本研究中，进行了氢溴化胍（GABr）后处理以提高MAPbI n-i-p平面钙钛矿太阳能电池的性能。对钙钛矿的详细表征表明，GABr后处理导致吸收层更光滑，陷阱态明显减少，能级排列得到优化。通过利用GABr后处理，MAPbI太阳能电池中的损失得以降低，滞后效应也得到有效缓解。结果，成功制备了基于玻璃基板、效率超过20%、开路电压为1.13 V且滞后现象显著减轻的太阳能电池。重要的是，我们还证明了GABr后处理在柔性器件中的有效性，其效率从15.77%提高到17.57%，主要是由于损失的消除。
