Photocurrent enhancement of hybrid perovskite CsGeBr_3 assisted two-dimensional WS_2 nano-flakes based on electron-hole mobility improvement

Rezaeinik Y.; Reyhani A.; Farjami-Shayesteh S.; Mortazavi S. Z.

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Photocurrent enhancement of hybrid perovskite CsGeBr_3 assisted two-dimensional WS_2 nano-flakes based on electron-hole mobility improvement

机译：杂交钙岩CSGEBR_3辅助二维WS_2纳米薄片的光电流增强基于电子 - 空穴迁移率改进

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The high-performance photocurrent generations of tungsten disulfide Nano-flakes (WS2 NFs) are studied for optoelectmnic applications and transistor structures. Moreover, a lead-free inorganic perovskite is formed by replacing of Lead component with germanium at CsPbX3 (X = Cl, Br, I) to achieve an excellent performance of the WS2 based photodetector. The results display that role of the pemvskite on the CsGeBr3/WS2 hetem-structure is excellent to enhance photocurrent of the hetero-structure. The external quantum efficiency of the CsGeBr3/WS2 hetero-structure is obtained to be similar to 151%, and a detectivity is about 4.72 x 10(8) Jones. Indeed, the external quantum efficiency and detectivity enhance about two times after drop casting of the CsGeBr3 on the WS2 NFs device under green illumination. This finding results from highly efficient photo-excited carrier separation in the interface of the WS2 and CsGeBr3. Drain-source photocurrent in terms of electrical field displays two regimes related to direct and indirect excitons. Indeed, the possibility of exciton indirect formation enhances with increasing of the electrical field due to transfer momentum to electron.

机译：研究了用于光学应用和晶体管结构的高性能光电流代钨纳米薄片（WS2 NFS）。此外，通过在CSPBX3（X = CL，BR，I）的锗用锗替换铅组分来形成无铅无机钙钛矿，以实现基于WS2的光电探测器的优异性能。结果显示PEMVSKITE在CSGEBR3 / WS2 Hetem结构上的作用非常优异，以增强异质结构的光电流。获得CSGEBR3 / WS2杂结构的外部量子效率与151％相似，探测器约为4.72×10（8）琼。实际上，在绿色照明下，外部量子效率和探测在WS2 NFS器件上的CSGEBR3铸造后的大约两次。这一发现来自WS2和CSGEBR3的界面中的高效照片激发载波分离。在电场方面的漏极光电流显示与直接和间接激子相关的两个制度。实际上，由于传递动量到电子，Exciton间接形成的可能性随着电场的增加而增强。

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来源
《Optical Materials》 |2021年第2期|110754.1-110754.8|共8页
作者
Rezaeinik Y.; Reyhani A.; Farjami-Shayesteh S.; Mortazavi S. Z.;
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作者单位

Univ Guilan Dept Phys POB 4199613776 Rasht Iran;

Imam Khomeini Int Univ Dept Phys Fac Sci POB 34149-16818 Qazvin Iran;

Univ Guilan Dept Phys POB 4199613776 Rasht Iran;

Imam Khomeini Int Univ Dept Phys Fac Sci POB 34149-16818 Qazvin Iran;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Tungsten disulfide; Hetero-structure; CsGeBr3 perovskite; Photocurrent enhancing; Electron-hole separation;

机译：钨二硫化物;杂结构;CSGEBR3 PEROVSKITE;光电流增强;电子孔分离;

Photocurrent enhancement of hybrid perovskite CsGeBr_3 assisted two-dimensional WS_2 nano-flakes based on electron-hole mobility improvement

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