A study on structural, optical, and electrical characteristics of perovskite CsPbBr3 QD/2D-TiSe2 nanosheet based nanocomposites for optoelectronic applications

Ashish Kumar; Sanjay Kumar Swami; Rohit Sharma; Sandeep Yadav; V. N. Singh; Joerg J. Schneider; O. P. Sinha; Ritu Srivastava

doi:10.1039/d1dt03423e

A study on structural, optical, and electrical characteristics of perovskite CsPbBr₃ QD/2D-TiSe₂ nanosheet based nanocomposites for optoelectronic applications

Ashish Kumar, Sanjay Kumar Swami, Rohit Sharma, Sandeep Yadav, V. N. Singh, Joerg J. Schneider, O. P. Sinha, Ritu Srivastava

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

Lead halide perovskite (CsPbBr₃) quantum dots (QDs) and two-dimensional (2D) layered transition metal dichalcogenides have a significant application in solution-processed optoelectronic devices. Here, we report the oleylamine-assisted exfoliation of TiSe₂ nanosheets (NSs) in dichlorobenzene with high concentration and stable dispersion. The functionalized TiSe₂ NSs were used to synthesize the solution-processed perovskite CsPbBr₃ QD/TiSe₂ NS-based nanocomposite. The perovskite QDs and TiSe₂ NSs were characterized by different techniques. The strong photoluminescence (PL) quenching and decreased lifetime decay of the nanocomposite indicates efficient charge transfer from photo-excited CsPbBr₃ to TiSe₂ NSs. The calculated charge-transfer rate constant (K_ET) from photo-excited CsPbBr₃ to TiSe₂ NSs increased from 1.50 × 10⁸ to 2.79 × 10⁸ s⁻¹ in different concentrations of TiSe₂ NSs (5 to 20 μg mL⁻¹), respectively. Furthermore, the photo-currents of CsPbBr₃ QD/TiSe₂ NS nanocomposite devices were dramatically enhanced ∼2 times compared to pristine CsPbBr₃ QD based devices, which supports the charge transfer and charge separation in nanocomposite devices.

Original language	English
Pages (from-to)	4104-4112
Number of pages	9
Journal	Dalton Transactions
Volume	51
Issue number	10
DOIs	https://doi.org/10.1039/d1dt03423e
State	Published - 1 Feb 2022
Externally published	Yes

ASJC Scopus subject areas

Inorganic Chemistry

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1039/d1dt03423e

Cite this

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title = "A study on structural, optical, and electrical characteristics of perovskite CsPbBr3 QD/2D-TiSe2 nanosheet based nanocomposites for optoelectronic applications",

abstract = "Lead halide perovskite (CsPbBr3) quantum dots (QDs) and two-dimensional (2D) layered transition metal dichalcogenides have a significant application in solution-processed optoelectronic devices. Here, we report the oleylamine-assisted exfoliation of TiSe2 nanosheets (NSs) in dichlorobenzene with high concentration and stable dispersion. The functionalized TiSe2 NSs were used to synthesize the solution-processed perovskite CsPbBr3 QD/TiSe2 NS-based nanocomposite. The perovskite QDs and TiSe2 NSs were characterized by different techniques. The strong photoluminescence (PL) quenching and decreased lifetime decay of the nanocomposite indicates efficient charge transfer from photo-excited CsPbBr3 to TiSe2 NSs. The calculated charge-transfer rate constant (KET) from photo-excited CsPbBr3 to TiSe2 NSs increased from 1.50 × 108 to 2.79 × 108 s−1 in different concentrations of TiSe2 NSs (5 to 20 μg mL−1), respectively. Furthermore, the photo-currents of CsPbBr3 QD/TiSe2 NS nanocomposite devices were dramatically enhanced ∼2 times compared to pristine CsPbBr3 QD based devices, which supports the charge transfer and charge separation in nanocomposite devices.",

author = "Ashish Kumar and Swami, {Sanjay Kumar} and Rohit Sharma and Sandeep Yadav and Singh, {V. N.} and Schneider, {Joerg J.} and Sinha, {O. P.} and Ritu Srivastava",

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T1 - A study on structural, optical, and electrical characteristics of perovskite CsPbBr3 QD/2D-TiSe2 nanosheet based nanocomposites for optoelectronic applications

AU - Kumar, Ashish

AU - Swami, Sanjay Kumar

AU - Sharma, Rohit

AU - Yadav, Sandeep

AU - Singh, V. N.

AU - Schneider, Joerg J.

AU - Sinha, O. P.

AU - Srivastava, Ritu

PY - 2022/2/1

Y1 - 2022/2/1

N2 - Lead halide perovskite (CsPbBr3) quantum dots (QDs) and two-dimensional (2D) layered transition metal dichalcogenides have a significant application in solution-processed optoelectronic devices. Here, we report the oleylamine-assisted exfoliation of TiSe2 nanosheets (NSs) in dichlorobenzene with high concentration and stable dispersion. The functionalized TiSe2 NSs were used to synthesize the solution-processed perovskite CsPbBr3 QD/TiSe2 NS-based nanocomposite. The perovskite QDs and TiSe2 NSs were characterized by different techniques. The strong photoluminescence (PL) quenching and decreased lifetime decay of the nanocomposite indicates efficient charge transfer from photo-excited CsPbBr3 to TiSe2 NSs. The calculated charge-transfer rate constant (KET) from photo-excited CsPbBr3 to TiSe2 NSs increased from 1.50 × 108 to 2.79 × 108 s−1 in different concentrations of TiSe2 NSs (5 to 20 μg mL−1), respectively. Furthermore, the photo-currents of CsPbBr3 QD/TiSe2 NS nanocomposite devices were dramatically enhanced ∼2 times compared to pristine CsPbBr3 QD based devices, which supports the charge transfer and charge separation in nanocomposite devices.

AB - Lead halide perovskite (CsPbBr3) quantum dots (QDs) and two-dimensional (2D) layered transition metal dichalcogenides have a significant application in solution-processed optoelectronic devices. Here, we report the oleylamine-assisted exfoliation of TiSe2 nanosheets (NSs) in dichlorobenzene with high concentration and stable dispersion. The functionalized TiSe2 NSs were used to synthesize the solution-processed perovskite CsPbBr3 QD/TiSe2 NS-based nanocomposite. The perovskite QDs and TiSe2 NSs were characterized by different techniques. The strong photoluminescence (PL) quenching and decreased lifetime decay of the nanocomposite indicates efficient charge transfer from photo-excited CsPbBr3 to TiSe2 NSs. The calculated charge-transfer rate constant (KET) from photo-excited CsPbBr3 to TiSe2 NSs increased from 1.50 × 108 to 2.79 × 108 s−1 in different concentrations of TiSe2 NSs (5 to 20 μg mL−1), respectively. Furthermore, the photo-currents of CsPbBr3 QD/TiSe2 NS nanocomposite devices were dramatically enhanced ∼2 times compared to pristine CsPbBr3 QD based devices, which supports the charge transfer and charge separation in nanocomposite devices.

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