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The effect of SrI2 substitution on perovskite film formation and its photovoltaic properties via two different deposition methods†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-03-29 00:00:00 , DOI: 10.1039/c8qi00131f Huanyu Zhang 1, 2, 3, 4 , Rui Li 1, 2, 3, 4 , Mei Zhang 1, 2, 3, 4 , Min Guo 1, 2, 3, 4
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-03-29 00:00:00 , DOI: 10.1039/c8qi00131f Huanyu Zhang 1, 2, 3, 4 , Rui Li 1, 2, 3, 4 , Mei Zhang 1, 2, 3, 4 , Min Guo 1, 2, 3, 4
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The poisonous metal lead (Pb) is one of the key limiting factors for the large-scale industrial application of perovskite solar cells (PSCs). Here, we replaced some of the lead iodide (PbI2) with strontium iodide (SrI2) in the precursor solution to prepare Pb-less perovskite films and fabricate mesoscopic solar cells via the antisolvent-assisted single step method and the two-step spin-coating method. The effect of Sr substitution on the film formation and photovoltaic properties of perovskites was illuminated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and time-resolved photoluminescence (TRPL) analyses. The results show that, in the antisolvent-assisted single step method, Sr substitution has an impact on the formation of the intermediate phase, resulting in a lower coverage and an increased defect density of perovskite films. When the Sr content rises from 0 to 5 mol%, the device's power conversion efficiency (PCE) decreases from 15.22% to 6.37%. In the two-step spin-coating method, a moderate amount of SrI2 can change the chemical composition of the PbI2 precursor, resulting in less PbI2 and a decreased defect density in perovskite films. When the Sr content is 10 mol% in the PbI2 solution, the solar cell exhibits a considerable PCE of 15.52% under AM 1.5G solar illumination.
中文翻译：
通过两种不同的沉积方法 ，SrI 2取代对钙钛矿膜形成及其光伏性能的影响†
有毒金属铅（Pb）是钙钛矿太阳能电池（PSC）大规模工业应用的关键限制因素之一。在这里，我们替换一些碘化铅的（PBI 2）与碘化锶（SRI 2）在所述前体溶液中以制备铅钙钛矿少膜并制造介观太阳能电池通过反溶剂辅助单步法和两步旋涂法。通过扫描电子显微镜（SEM），X射线衍射（XRD）和时间分辨光致发光（TRPL）分析阐明了Sr取代对钙钛矿膜形成和光伏性能的影响。结果表明，在抗溶剂辅助的单步法中，Sr取代对中间相的形成有影响，导致钙钛矿膜的覆盖率降低和缺陷密度增加。当Sr含量从0到5 mol％升高时，器件的功率转换效率（PCE）从15.22％降低到6.37％。在两步旋涂法，SRI适量2可以改变碘化铅的化学组成2前驱体，导致钙钛矿薄膜中的PbI 2减少，缺陷密度降低。当PbI 2溶液中Sr含量为10 mol％时，在AM 1.5G太阳光下，太阳能电池的PCE表现为15.52％。
更新日期：2018-03-29
中文翻译：
通过两种不同的沉积方法 ，SrI 2取代对钙钛矿膜形成及其光伏性能的影响†
有毒金属铅（Pb）是钙钛矿太阳能电池（PSC）大规模工业应用的关键限制因素之一。在这里，我们替换一些碘化铅的（PBI 2）与碘化锶（SRI 2）在所述前体溶液中以制备铅钙钛矿少膜并制造介观太阳能电池通过反溶剂辅助单步法和两步旋涂法。通过扫描电子显微镜（SEM），X射线衍射（XRD）和时间分辨光致发光（TRPL）分析阐明了Sr取代对钙钛矿膜形成和光伏性能的影响。结果表明，在抗溶剂辅助的单步法中，Sr取代对中间相的形成有影响，导致钙钛矿膜的覆盖率降低和缺陷密度增加。当Sr含量从0到5 mol％升高时，器件的功率转换效率（PCE）从15.22％降低到6.37％。在两步旋涂法，SRI适量2可以改变碘化铅的化学组成2前驱体，导致钙钛矿薄膜中的PbI 2减少，缺陷密度降低。当PbI 2溶液中Sr含量为10 mol％时，在AM 1.5G太阳光下，太阳能电池的PCE表现为15.52％。
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