Interface Modification for Planar Perovskite Solar Cell Using Room-Temperature Deposited Nb2O5 as Electron Transportation Layer
Interface Modification for Planar Perovskite Solar Cell Using Room-Temperature Deposited Nb2O5 as Electron Transportation Layer
复制标题
使用室温沉积 Nb2O5 作为电子传输层的平面钙钛矿太阳能电池的界面改性
DOI：
10.1021/acsaem.8b00094
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发表时间：
2018-04
影响因子：
6.4
通讯作者：
Junhao Chu
中科院分区：
文献类型：
--
作者：
Yixin Guo;Jiahua Tao;Fuwen Shi;Xiaobo Hu;Zhigao Hu;Kezhi Zhang;Wenjuan Cheng;Shaohua Zuo;Jinchun Jiang;Junhao Chu
与晶态二氧化钛相比，非晶态Nb2O5由于具有良好的光学透过率、低温制备工艺以及与二氧化钛相近的FeMI能级，已被用作平面钙钛矿太阳电池的电子传输层。但由于其低的电子迁移率和室温沉积的表面缺陷，电子转移速率仍然受到限制。在钙钛矿和Nb2O5薄膜之间插入了一种新型的双缓冲层[6，6]-苯基-C61-丁酸甲酯(PCBM)/离子液体([EMIM]PF6)。PCBM可以钝化Nb2O5的表面，提高其电子提取能力。[EMIM]PF6的加入提高了PCBM的亲水性，降低了PCBM在DMF中的溶解。采用双缓冲层获得了较高的开路电压(1.09V以上)和18.8%的转换效率，这是目前所知的Nb2O5基钙钛矿太阳能电池最高的光电转换效率。结果表明，室温沉积Nb_2O_5可以替代晶化的TiO_2薄膜，所提出的改性策略有助于高效平面钙钛矿太阳电池界面改性层的进一步发展。
Compared with crystallized TiO2, amorphous Nb2O5has been applied in planar perovskite solar cell as electron transportation layer because of its excellent optical transmittance, low temperature preparation process, and similar Femi level with TiO2. However, the electron transfer rate is still limited by its low electron mobility and surface defect via room-temperature deposition process. Herein, a novel double buffer layer of [6,6]-phenyl-C61- butyric acid methyl ester(PCBM)/ionic liquid([EMIM]PF6) has been inserted between perovskite and Nb2O5film. The PCBM could passive the surface of Nb2O5and improve electron extraction ability. The insert of [EMIM]PF6could improve the hydrophilic of PCBM and decrease the dissolution of PCBM in DMF during spin-coat perovskite precursor solution. A relatively high open voltage (over 1.09 V) and conversion efficiency of 18.8% have been achieved by using a double buffer layer which is the highest PCE of Nb2O5based perovskite solar cell to our best knowledge. The results indicate room temperature deposited Nb2O5can be a suitable candidate for replacing crystallized TiO2film and proposed modification strategy could facilitate the future development of interface modified layer for high efficient planar perovskite solar cell.