Although the application of graphene‐derived nanomaterials in the electron transport layer (ETL), hole transport layer (HTL), or top electrode of perovskite solar cells (PSCs) has been thoroughly studied, the effects of inserting such materials into the perovskite layer of PSCs is not well understood. In this study, pristine graphene nanofibers were introduced into the perovskite layer of PSCs for the first time. The quality of the electrospun graphene nanofibers was optimized by controlled centrifugation of graphene sheets in the precursor suspension. Under optimized conditions, the device power conversion efficiency increased from 17.51 % without graphene to 19.83 % with graphene nanofibers, representing a 13 % increase. The introduction of graphene nanofibers into the perovskite layer led to a dramatic increase in the grain size of the perovskite layer to over 2 μm, owing to improved nucleation and crystallization at the nanofiber interface, which led to much higher FF and J_sc values. The significant increases in J_sc and V_oc are attributed to the improved charge‐transport properties of the graphene nanofibers with superb charge conductivity introduced into the perovskite layer. The latter was independently verified by the measured electron transport time. The stability of the device was also improved. In summary, an effective approach has been developed to improve the performance of PSCs by using pure graphene nanofibers for the first time.

中文翻译：

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将石墨烯纳米纤维引入钙钛矿太阳能电池的钙钛矿层中

尽管已经对石墨烯衍生的纳米材料在钙钛矿型太阳能电池（PSC）的电子传输层（ETL），空穴传输层（HTL）或顶部电极中的应用进行了深入研究，但将此类材料插入到钙钛矿型钙钛矿层中的效果对PSC的了解还不是很清楚。在这项研究中，原始的石墨烯纳米纤维首次引入了PSC的钙钛矿层。电纺石墨烯纳米纤维的质量通过前驱体悬浮液中石墨烯片的受控离心来优化。在优化条件下，器件功率转换效率从不使用石墨烯的17.51％提高到使用石墨烯纳米纤维的19.83％，增加了13％。J _sc值。J _sc和V _oc的显着增加归因于石墨烯纳米纤维在钙钛矿层中引入了极高的电荷电导率，从而改善了电荷传输性能。后者由测得的电子传输时间独立验证。该装置的稳定性也得到了改善。总之，已经开发出了一种有效的方法来首次通过使用纯石墨烯纳米纤维来改善PSC的性能。