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Highly Air-Stable Single-Crystalline β-CsPbI_3 Nanorods: A Platform for Inverted Perovskite Solar Cells

机译:高度空气稳定的单晶β-CSPBI_3纳米码:倒钙钛矿太阳能电池平台

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摘要

The synthesis of single-crystalline beta-CsPbI(3)perovskite nanorods (NRs) using a colloidal process is reported, exhibiting their improved photostability under 45-55% humidity. The crystal structure of CsPbI(3)NRs films is investigated using Rietveld refined X-ray diffraction (XRD) patterns to determine crystallographic parameters and the phase transformation from orthorhombic (gamma-CsPbI3) to tetragonal (beta-CsPbI3) on annealing at 150 degrees C. Atomic resolution transmission electron microscopy images are utilized to determine the probable atomic distribution of Cs, Pb, and I atoms in a single beta-phase CsPbI3NR, in agreement with the XRD structure and selected area electron diffraction pattern, indicating the growth of single crystalline beta-CsPbI3NR. The calculation of the electronic band structure of tetragonal beta-CsPbI(3)using density functional theory (DFT) reveals a direct transition with a lower band gap and a higher absorption coefficient in the solar spectrum, as compared to its gamma-phase. An air-stable (45-55% humidity) inverted perovskite solar cell, employing beta-CsPbI(3)NRs without any encapsulation, yields an efficiency of 7.3% with 78% enhancement over the gamma-phase, showing its potential for future low cost photovoltaic devices.
机译:报告使用胶体过程的单晶β-Cspbi(3)钙钛矿纳米棒(NRS)的合成,其湿度下的可光稳定性提高。使用RIETVELD精制X射线衍射(XRD)图案来研究CSPBI(3)NRS膜的晶体结构,以确定在150度的退火上的正晶(γ-CSPBI3)中的结晶参数和从正交(γ-CSPBI3)的相变C.原子分辨率透射电子显微镜图像用于确定单一β相CSPBI3NR中Cs,Pb和I原子的可能原子分布,同时与XRD结构和选择的区域电子衍射图案一致,表明单一的生长结晶β-cspbi3nr。使用密度函数理论(DFT)的四边形β-CSPBI(3)的电子带结构的计算显示,与其伽马相相比,在太阳光谱中具有较低带隙的直接过渡和较高的吸收系数。空气稳定(45-55%湿度)倒钙钛矿太阳能电池,使用β-CSPBI(3)NRS没有任何包封,产生7.3%的效率,在伽马相上增强78%,表明其未来低的潜力成本光伏器件。

著录项

  • 来源
    《Advanced energy materials》 |2020年第30期|2001305.1-2001305.9|共9页
  • 作者单位

    Indian Inst Technol Kharagpur Sch Nano Sci & Technol Kharagpur 721803 W Bengal India|Indian Inst Technol Kharagpur Dept Phys Kharagpur 721302 W Bengal India;

    Indian Inst Technol Kharagpur Sch Nano Sci & Technol Kharagpur 721803 W Bengal India;

    Indian Inst Technol Kharagpur Dept Phys Kharagpur 721302 W Bengal India;

    HBNI Saha Inst Nucl Phys Surface Phys & Mat Sci Div 1-AF Bidhannagar Kolkata 700064 India;

    Indian Inst Technol Kharagpur Dept Phys Kharagpur 721302 W Bengal India;

    Indian Inst Technol Kharagpur Dept Phys Kharagpur 721302 W Bengal India|SN Bose Natl Ctr Basic Sci Sect 3 Kolkata 700098 India;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    CsPbI3; DFT; inverted perovskite solar cells; single-crystalline NRs;

    机译:CSPBI3;DFT;倒钙钛矿太阳能电池;单晶NRS;

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