Highly Reproducible Perovskite Solar Cells with Average Efficiency of 18.3% and Best Efficiency of 19.7% Fabricated via Lewis Base Adduct of Lead(II) Iodide
Highly Reproducible Perovskite Solar Cells with Average Efficiency of 18.3% and Best Efficiency of 19.7% Fabricated via Lewis Base Adduct of Lead(II) Iodide
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DOI：
10.1021/jacs.5b04930
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发表时间：
2015-07-15
影响因子：
15
通讯作者：
Park, Nam-Gyu
中科院分区：
文献类型：
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作者：
Ahn, Namyoung;Son, Dae-Yong;Park, Nam-Gyu
通过碘化铅（II）的刘易斯碱加合物可重复地制造高效率钙钛矿太阳能电池。将PbI 2溶于含有等摩尔N，N-二甲基亚砜（DMSO）和CH 3 NH3 I的N，N-二甲基甲酰胺中。对于裸DMSO，S=O的伸缩振动出现在1045 cm（-1）处，当DMSO与PbI 2和PbI 2 + CH 3 NH3 I反应时，其分别移动到1020和1015 cm（-1），表明由于刘易斯碱DMSO和/或碘化物（I-）与刘易斯酸PbI 2之间的相互作用，形成了PbI2.DMSO和CH3NH3I.PbI2.DMSO的加合物。旋涂含有PbI 2、CH 3 NH3 I和DMSO（1：1：1摩尔%）的DMF溶液形成透明的加合物膜，由于从加合物中除去挥发性DMSO，在65 ℃的低温下加热1分钟后，该加合物膜转化为深棕色膜。加合物诱导的CH_3NH_3PbI_3具有高的电荷提取特性，空穴迁移率高达3.9 × 10 ~（-3）cm ~（2）/（Vs），复合速率低。41个电池的平均功率转换效率（PCE）为18.3%，最好的PCE为19.7%，通过加合物的方法。
High efficiency perovskite solar cells were fabricated reproducibly via Lewis base adduct of lead(II) iodide. PbI2 was dissolved in N,N-dimethyformamide with equimolar N,N-dimethyl sulfoxide (DMSO) and CH3NH3I. Stretching vibration of S=O appeared at 1045 cm(-1) for bare DMSO, which was shifted to 1020 and 1015 cm(-1) upon reacting DMSO with PbI2 and PbI2 + CH3NH3I, respectively, indicative of forming the adduct of PbI2.DMSO and CH3NH3I.PbI2.DMSO due to interaction between Lewis base DMSO and/or iodide (I-) and Lewis acid PbI2. Spin-coating of a DMF solution containing PbI2, CH3NH3I, and DMSO (1:1:1 mol %) formed a transparent adduct film, which was converted to a dark brown film upon heating at low temperature of 65 degrees C for 1 min due to removal of the volatile DMSO from the adduct. The adduct-induced CH3NH3PbI3 exhibited high charge extraction characteristics with hole mobility as high as 3.9 x 10(-3) cm(2)/(V s) and slow recombination rate. Average power conversion efficiency (PCE) of 18.3% was achieved from 41 cells and the best PCE of 19.7% was attained via adduct approach.