Journal of Inorganic Materials ›› 2023, Vol. 38 ›› Issue (8): 893-900.DOI: 10.15541/jim20230008
• RESEARCH ARTICLE • Previous Articles Next Articles
FAN Jiashun1(
), XIA Donglin2(), LIU Baoshun2
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.cnAbout author:FAN Jiashun (1999-), male, Master candidate. E-mail: 1712723883@qq.com
Supported by:CLC Number:
FAN Jiashun, XIA Donglin, LIU Baoshun. Temperature Dependent Transient Photoconductive Response of CsPbBr3 NCs[J]. Journal of Inorganic Materials, 2023, 38(8): 893-900.
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
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
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
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
| 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) |
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) |
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
| 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) |
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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