温度相关的CsPbBr3纳米晶瞬态光电导响应研究

doi:10.15541/jim20230008

无机材料学报 ›› 2023, Vol. 38 ›› Issue (8): 893-900.DOI: 10.15541/jim20230008 CSTR: 32189.14.10.15541/jim20230008

温度相关的CsPbBr₃纳米晶瞬态光电导响应研究

樊家顺¹(), 夏冬林²(), 刘保顺²

1.武汉理工大学材料科学与工程学院, 武汉 430070
2.武汉理工大学硅酸盐建筑材料国家重点实验室, 武汉 430070

收稿日期:2023-01-04 修回日期:2023-02-12 出版日期:2023-08-20 网络出版日期:2023-03-17
通讯作者: 夏冬林, 副研究员. E-mail: donglinxia@126.com
作者简介:樊家顺(1999-), 男, 硕士研究生. E-mail: 1712723883@qq.com
基金资助:
国家自然科学基金(51772230)

Temperature Dependent Transient Photoconductive Response of CsPbBr₃ NCs

FAN Jiashun¹(), XIA Donglin²(), LIU Baoshun²

1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China

Received:2023-01-04 Revised:2023-02-12 Published:2023-08-20 Online:2023-03-17
Contact: XIA Donglin, associate professor. E-mail: donglinxia@whut.edu.cn
About author:FAN Jiashun (1999-), male, Master candidate. E-mail: 1712723883@qq.com
Supported by:
National Natural Science Foundation of China(51772230)

摘要/Abstract

摘要：

近年来, 全无机铯铅卤化钙钛矿CsPbX₃(X=Cl, Br, I)纳米晶(NCs)材料因具有长载流子寿命、强光吸收、低成本制造和带隙可调性等独特的性能已成为研究的热点, 但专注于CsPbBr₃纳米晶瞬态光电导的相关研究却很少。本工作通过配体辅助再沉淀法制备了CsPbBr₃纳米晶体, 并改进了光电导薄膜样品的制样方法和真空瞬态光电导测试装置, 研究了不同温度和不同激发功率对CsPbBr₃纳米晶瞬态光电导的影响。不同温度的瞬态光电导实验结果表明, 在133~273 K温度范围内, 光生电流衰减速率随着温度增加而逐渐减小, 而在273~373 K温度范围内, 光生电流衰减速率随着温度升高而逐渐增大。不同激发功率的瞬态光电导实验表明, 激发功率从200 mW逐渐增大到1000 mW时, 光生电流衰减速率增大。本工作的研究方法为研究光激发光生载流子的动力学相关行为提供了一个的新思路。

关键词: 卤化铅钙钛矿, CsPbBr₃纳米晶, 光生电流, 瞬态光电导, 载流子弛豫

Abstract:

In recent years, all-inorganic cesium-lead halogenated perovskite CsPbX₃ (X=Cl, Br, I) nanocrystalline (NCs) materials have become the focus of scientific research due to their unique properties such as long carrier life, strong light absorption, low-cost manufacturing, and band gap adjustability. However, the transient photoconductivity of CsPbBr₃ nanocrystals have been hardly researched. In this work, CsPbBr₃ nanocrystals were prepared by ligand-assisted re-precipitation method. Then their photoconductive sample preparation and test device of vacuum transient photoconductivity were improved. Effects of different temperatures and different excitation powers on transient photoconductivity of CsPbBr₃ nanocrystals were studied. Experiment results show that the photo-generated current decay rate is gradually reduced within the temperature range from 133 K to 273 K, and increases gradually within the temperature range from 273 K to 373 K with temperature increasing. Results of excitation power-dependent show that the photo-generated current decay rate increases when the excitation power increases from 200 to 1000 mW. The research method of this study provides a new idea for studying the dynamics related behavior of photoexcited photo-generated carriers.

Key words: lead halide perovskite, CsPbBr₃ nanocrystals, photo-generated current, transient photoconductivity, carrier relaxation

中图分类号:

O644
O649

樊家顺, 夏冬林, 刘保顺. 温度相关的CsPbBr₃纳米晶瞬态光电导响应研究[J]. 无机材料学报, 2023, 38(8): 893-900.

FAN Jiashun, XIA Donglin, LIU Baoshun. Temperature Dependent Transient Photoconductive Response of CsPbBr₃ NCs[J]. Journal of Inorganic Materials, 2023, 38(8): 893-900.

图/表 7

图1 CsPbBr3 NC薄膜样品的制备流程和瞬态光电导测试原理

Fig. 1 Preparation process of CsPbBr3 NC thin film sample and schematic diagram of the transient photoconduction test (a-c) Preparation process of photoconductive samples; (d) Schematic diagram of the transient photoconduction test

图2 CsPbBr3 NCs的光吸收和PL光谱及其结构与形貌图

Fig. 2 Optical absorption, PL spectra, microstructure and micromorphology of CsPbBr3 NCs (a) Optical absorption and PL spectra of CsPbBr3 NCs in n-hexane; (b) XRD pattern; (c) TEM image; (d) High resolution TEM image

图3 在不同温度和激发功率下光电导样品的光生电流随光循环时间(t)的变化曲线

Fig. 3 Curves of photo-generated current with light cycle time(t) at different temperatures and excitation powers for photoconductive samples (a) Current-voltage curve of 0-40 V measured at 133-373 K; (b, c) Curves of photo-generated current change with light cycle time at different temperatures; (d) Curves of photo-generated current change with light cycle time at different laser excitation power; Colorful figures are available on website

图4 光电导样品的温度相关的载流子光生电流和最快衰减时间常数曲线

Fig. 4 Curves of temperature-dependent carrier photo-generated currents and the fastest decay time constants of the photoconductive samples Enlarged views of (a, b) falling and (c) rising edges with temperature changed from 133 to 373 K; (d, e) Normalized current-time curves and their fitting curves of temperature changed with temperature; (f) The fastest decay time constant τ1 obtained by fitting from experimental data of (d, e) with temperature change; Colorful figures are available on website

表1 不同温度下时间-归一化光生电流曲线的各拟合参数

Table 1 Fitting parameters of time normalized current curve at different temperatures

Temperatures/K	τ₁/μs	τ₂/μs	τ₃/μs
133	(3.759±0.223)	(124.77±6.69)	(1324.35±361.18)
153	(3.723±0.216)	(127.40±5.72)	(1545.52±582.47)
173	(3.885±0.209)	(134.73±6.23)	(2141.44±1403.33)
193	(4.680±0.260)	(107.52±5.69)	(720.84±118.71)
213	(5.015±0.240)	(128.03±4.42)	(1473.34±412.23)
233	(5.985±0.322)	(124.42±4.29)	(1725.43±171.92)
253	(6.439±0.270)	(133.90±3.88)	(1535.70±80.51)
273	(7.721±0.193)	(133.68±2.92)	(1249.10±30.38)
293	(5.792±0.152)	(121.84±2.33)	(1249.65±34.02)
313	(5.176±0.140)	(123.42±2.59)	(1215.50±43.39)
333	(5.238±0.137)	(119.48±2.78)	(1061.38±47.03)
353	(4.638±0.114)	(115.78±3.05)	(1127.95±113.98)
373	(4.254±0.128)	(116.16±4.02)	(2370.56±1223.21)

图5 激发功率相关的光电导样品载流子光生电流和最快衰减时间常数曲线

Fig. 5 Curves of excitation power-dependent carrier photo-generated current and the fastest decay time constant of the photoconductive samples (a) Curve of photo-generated current of samples with light cycle time at different excitation power; (b) Normalized current-time curve and their fitting curve with different excitation power; (c) The fastest decay time constant τ1 obtained by fitting from experimental data of (b) with excitation power change; Colorful figures are available on website

表2 不同功率下时间-归一化光生电流曲线的各拟合参数

Table 2 Fitting parameters of time normalized current curve at different powers

Power/mW	τ₁/μs	τ₂/μs	τ₃/μs
200	(25.955±0.493)	(117.67±22.31)	(822.18±234.43)
300	(15.411±0.686)	(91.76±17.61)	(502.61±110.28)
400	(10.856±0.392)	(86.72±13.96)	(423.04±60.38)
500	(13.300±0.351)	(100.49±15.70)	(444.26±71.77)
600	(10.824±0.281)	(52.30±4.84)	(318.36±12.73)
700	(8.775±0.322)	(74.87±6.95)	(353.29±21.81)
800	(11.546±0.210)	(62.75±6.64)	(325.15±15.40)
900	(11.412±0.183)	(89.94±7.53)	(386.28±29.85)
1000	(9.431±0.132)	(51.78±2.85)	(294.00±7.33)

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温度相关的CsPbBr₃纳米晶瞬态光电导响应研究

Temperature Dependent Transient Photoconductive Response of CsPbBr₃ NCs

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