Stability-improved perovskite solar cells through 4-tertbutylpyridine surface-passivated perovskite layer fabricated in ambient air

Ezike Sabastine Chinedu; Alabi Aderemi Babatunde; Ossai Amarachukwu Nneka; Aina Adebayo Olaniyi

摘要

Methylammonium lead iodide (CH3NH3PbI3) perovskite solar cell (PSC) is one of the third generations of photovoltaic (PV) research interest in recent years. The solar cell degrades very fast in ambient air and this poses major challenge for its commercialization. Hence, this report investigates surface-passivated perovskite layer using hydrophobic material, 4-tertbutylpyridine (tBP), to modify the surface of the perovskite layer and create ambient air-resistant layer that results in improved stability of PSC performance. The fabricated films and devices were studied using UV-Vis spectrophotometer, Fourier-transform infrared (FTIR) spectrometer, Scanning Electron Microscopy (SEM), solar simulator equipped with Keithley source meter and X-ray diffractometer (XRD). The concentration of tBP was varied from 50 to 200 mu l and the samples were aged in ambient air for 120 h. Eventually, the surface passivated film and the device showed improved stability performance. The champion cells of tBP-treated and untreated freshly fabricated devices showed PCE of 10.32% and 6.37%, respectively. Again, the PCE of tBP-treated and untreated devices reduced by 6.45% (10.32%-9.66%) and 60.75% (6.37%- 2.50%) respectively for 120 h. Additionally, continuous light-soaking for 8 h shows that tBP-treated device is stable in its performance when compare with the tBP-untreated device. The statistical analyses carried out showed that device PCE stability depended mainly on the device tBP treatment. Also, device treatment varies directly proportional to the PCE. The probability plot from the statistical analysis also showed that observed (experimental) data agreed with predicted data. Consequently, this work implies that ambient stability of perovskite solar cell can be achieved from surface-passivation of perovskite layer for commercialization of the PSCs.commentSuperscript/Subscript Available/comment

机译：甲基烷基铅碘化物（CH3NH3PBI3）Perovskite太阳能电池（PSC）是近年来第三代光伏（PV）研究兴趣之一。太阳能电池在环境空气中非常快速地降低，这为其商业化带来了重大挑战。因此，本报告使用疏水材料，4-叔丁基吡啶（TBP）来研究表面钝化的钙钛矿层，以改变钙钛矿层的表面，并产生环境的空气耐耐耐阻挡层，导致PSC性能的稳定性提高。使用UV-Vis分光光度计，傅立叶变换红外（FTIR）光谱仪，扫描电子显微镜（SEM），X射线源仪（XRD）的太阳能模拟器（XRD）进行制造的薄膜和装置。 TBP的浓度从50-200μL变化，样品在环境空气中老化120小时。最终，表面钝化的薄膜和该装置显示出改善的稳定性性能。 TBP处理和未处理的新制造的装置的冠军细胞分别显示出10.32％和6.37％的PCE。同样，TBP处理和未处理装置的PCE分别减少了6.45％（10.32％-9.66％）和60.75％（6.37％ - 2.50％），120小时。另外，8小时的连续光浸泡显示，当与TBP-未处理的装置相比，TBP处理装置在其性能下是稳定的。进行的统计分析表明，装置PCE稳定性主要依赖于器件TBP处理。此外，设备处理与PCE成正比成比例。统计分析的概率图还显示观察到（实验）与预测数据同意的数据。因此，该工作意味着可以从PECSKITE层的表面钝化来实现PEROVSKITE太阳能电池的环境稳定性，用于商业化PSC。<注释>上标/下标可用

Stability-improved perovskite solar cells through 4-tertbutylpyridine surface-passivated perovskite layer fabricated in ambient air

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