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Beneficial effects of potassium iodide incorporation on grain boundaries and interfaces of perovskite solar cells

机译：碘化钾掺入钙钛矿太阳能电池晶界和界面的有益效果

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Grain boundaries and interfacial impurities are the main factors that limit the further development of polycrystalline perovskite solar cells because their existence severely deteriorates the device performance. In order to optimize the efficiency of perovskite solar cells, it is essential to eliminate these defects. In the present work, potassium iodide (KI) is incorporated into the perovskite absorber. KI incorporation improves the crystallinity of the perovskite, increases the grain size, and decreases the contact potential distribution at the grain boundary, which are verified by X-ray diffraction, scanning electronic microscopy and Kelvin probe force microscopy. Besides, the activation energy of the recombination, estimated from the temperature dependent current-voltage of perovskite solar cells, is larger than the bandgap calculated from the temperature coefficient. These suggest that KI incorporation effectively passivates the grain boundaries and interfacial defects. As a result, charge trapping in the absorber as well as the bimolecular and trap-assisted recombination of the device are significantly suppressed. Consequently, the open circuit voltage and fill factor of the incorporated devices are greatly improved, enabling an optimized power conversion efficiency of 19.5%, in comparison with that of 17.3% for the control one. Our work provides an effective strategy of defect passivation in perovskite solar cells by KI incorporation and clarifies the mechanism of the performance optimization of KI incorporated devices.
机译：晶界和界面杂质是限制多晶钙钛矿太阳能电池进一步发展的主要因素，因为它们的存在严重降低了器件性能。为了优化Perovskite太阳能电池的效率，必须消除这些缺陷。在本作工作中，碘化钾（Ki）掺入Perovskite吸收剂中。 KI掺入改善了钙钛矿的结晶度，增加了晶粒尺寸，并通过X射线衍射，扫描电子显微镜和开尔文探针力显微镜验证，降低晶界处的接触电位分布。此外，从钙钛矿太阳能电池的温度依赖性电流估计的重组的激活能量大于由温度系数计算的带隙。这些表明KI掺入有效地钝化了晶界和界面缺陷。结果，显着抑制了吸收器中的电荷捕获以及器件的双分子和疏水阀辅助重组。因此，具有大大提高了掺入器件的开路电压和填充因子，使得控制器1的优化功率转换效率为19.5％，相比之下为17.3％。我们的作品通过KI Incorporation提供了佩罗夫斯基特太阳能电池缺陷钝化的有效策略，并阐明了KI Inclinated器件的性能优化的机制。

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    《RSC Advances》 |2019年第49期|共8页
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  • 正文语种 eng
  • 中图分类 化学;
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