Charge Carrier Recombination in AlGaAs Studied by Time-Resolved Microwave Conductivity Experiments

1989 ◽  
Vol 145 ◽  
Author(s):  
A. Werner ◽  
A. M. Agarwal ◽  
T. D. Moustakas ◽  
M. Kunst
Keyword(s):  
Molecular Beam ◽  
Composition Range ◽  
Defect States ◽  
Decay Kinetics ◽  
Time Resolved ◽  
Effective Electron ◽  
Carrier Recombination ◽  
Transient Photoconductivity ◽  
Recombination Processes ◽  
Charge Carrier Recombination

AbstractAlxGa1-xAs films, doped with silicon in the 1 x 1018 cm-3 range, have been prepared in the composition range x = 0.20 - 0.46 by molecular beam epitaxy. The influence of defect states on excess carrier trapping and recombination processes is studied by a contactless transient photoconductivity technique in the microwave region. Effective electron life- times in the 1 x 10-5s range for the 20% Al film down to the 1 x 10-7s range for the 46% Al film were found, indicating a larger density of electron traps in more Al rich films. The decay kinetics in AlGaAs is compared with the decay kinetics in GaAs.

scholarly journals Perovskite Solar Cells Yielding Reproducible Photovoltage of 1.20 V

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Essa A. Alharbi ◽  
M. Ibrahim Dar ◽  
Neha Arora ◽  
Mohammad Hayal Alotaibi ◽  
Yahya A. Alzhrani ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Perovskite Solar Cells ◽  
Precursor Solution ◽  
Nonradiative Recombination ◽  
Time Resolved ◽  
Carrier Recombination ◽  
Absorber Material ◽  
Charge Carrier Recombination ◽  
Conversion Efficiencies

High photovoltages and power conversion efficiencies of perovskite solar cells (PSCs) can be realized by controlling the undesired nonradiative charge carrier recombination. Here, we introduce a judicious amount of guanidinium iodide into mixed-cation and mixed-halide perovskite films to suppress the parasitic charge carrier recombination, which enabled the fabrication of >20% efficient and operationally stable PSCs yielding reproducible photovoltage as high as 1.20 V. By introducing guanidinium iodide into the perovskite precursor solution, the bandgap of the resulting absorber material changed minimally; however, the nonradiative recombination diminished considerably as revealed by time-resolved photoluminescence and electroluminescence studies. Furthermore, using capacitance-frequency measurements, we were able to correlate the hysteresis features exhibited by the PSCs with interfacial charge accumulation. This study opens up a path to realize new record efficiencies for PSCs based on guanidinium iodide doped perovskite films.

scholarly journals Perovskite Solar Cells Yielding Reproducible Photovoltage of 1.20 V

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Essa A. Alharbi ◽  
M. Ibrahim Dar ◽  
Neha Arora ◽  
Mohammad Hayal Alotaibi ◽  
Yahya A. Alzhrani ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Carrier ◽  
Perovskite Solar Cells ◽  
Precursor Solution ◽  
Nonradiative Recombination ◽  
Time Resolved ◽  
Carrier Recombination ◽  
Absorber Material ◽  
Charge Carrier Recombination ◽  
Conversion Efficiencies

High photovoltages and power conversion efficiencies of perovskite solar cells (PSCs) can be realized by controlling the undesired nonradiative charge carrier recombination. Here, we introduce a judicious amount of guanidinium iodide into mixed-cation and mixed-halide perovskite films to suppress the parasitic charge carrier recombination, which enabled the fabrication of >20% efficient and operationally stable PSCs yielding reproducible photovoltage as high as 1.20 V. By introducing guanidinium iodide into the perovskite precursor solution, the bandgap of the resulting absorber material changed minimally; however, the nonradiative recombination diminished considerably as revealed by time-resolved photoluminescence and electroluminescence studies. Furthermore, using capacitance-frequency measurements, we were able to correlate the hysteresis features exhibited by the PSCs with interfacial charge accumulation. This study opens up a path to realize new record efficiencies for PSCs based on guanidinium iodide doped perovskite films.

Temperature variation of nonradiative carrier recombination processes in high-quality CuGaSe2 thin films grown by molecular beam epitaxy

2000 ◽  
Vol 77 (2) ◽  
pp. 259-261 ◽  
Author(s):  
Kenji Yoshino ◽  
Daisuke Maruoka ◽  
Tetsuo Ikari ◽  
Paul J. Fons ◽  
Shigeru Niki ◽  
...  
Keyword(s):  
Thin Films ◽  
Molecular Beam Epitaxy ◽  
Temperature Variation ◽  
Molecular Beam ◽  
High Quality ◽  
Carrier Recombination ◽  
Recombination Processes

Time-resolved microwave technique for ultrafast charge-carrier recombination time measurements in diamonds and GaAs

1999 ◽  
Vol 74 (12) ◽  
pp. 1731-1733 ◽  
Author(s):  
S. V. Garnov ◽  
A. I. Ritus ◽  
S. M. Klimentov ◽  
S. M. Pimenov ◽  
V. I. Konov ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Time Resolved ◽  
Recombination Time ◽  
Microwave Technique ◽  
Carrier Recombination ◽  
Charge Carrier Recombination

Exciton dissociation and charge carrier recombination processes in organic semiconductors

2011 ◽  
Vol 135 (22) ◽  
pp. 224901 ◽  
Author(s):  
Luiz A. Ribeiro ◽  
Pedro H. Oliveira Neto ◽  
Wiliam F. da Cunha ◽  
Luiz F. Roncaratti ◽  
Ricardo Gargano ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Organic Semiconductors ◽  
Exciton Dissociation ◽  
Carrier Recombination ◽  
Recombination Processes ◽  
Charge Carrier Recombination

scholarly journals Hybrid perovskites: Charge carrier recombination effects in photovoltaic devices

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
O. Amora
Keyword(s):  
Charge Carrier ◽  
Bulk Material ◽  
Low Cost ◽  
Electronic Conductivity ◽  
Perovskite Solar Cells ◽  
Carrier Recombination ◽  
Recombination Processes ◽  
Halide Perovskites ◽  
Charge Carrier Recombination ◽  
Lead Halide

Hybrid lead halide perovskites emerged at the beginning of 2010s decade as one of the most promising materials for photovoltaic applications. Easy and low-cost solution-based fabrication processes can be used, obtaining perovskite solar cells (PSCs) with efficiencies above 20%. However, there still are some major issues to overcome, like stabiliddty, and the general understanding of the recombination mechanisms resHybrid lead halide perovskites emerged at the beginning of 2010s decade as one of the most promising materials for photovoltaic applications. Easy and low-cost solution-based fabrication processes can be used, obtaining perovskite solar cells (PSCs) with efficiencies above 20%. However, there still are some major issues to overcome, like stability, and the general understanding of the recombination mechanisms results particularly puzzling. In this chapter, an analysis is provided on most recent research results about the different mechanisms, location and relationships of charge carrier recombination in PSCs. After introducing the theoretical framework, including the main transport equations and relations with luminescence techniques, the radiative and non-radiative natures of recombination are commented and compared in terms of main contributions. Also, the effects of changing the perovskite composition and morphology are surveyed. The location of the recombination processes, whether in the bulk material or towards the interface, are tackled, as well as related features with the current-voltage hysteresis. On the latter, and along the complete chapter, the dual ionic-electronic conductivity of hybrid lead halide perovskites is particularly attended. ults particularly puzzling. In this chapter, an analysis is provided on most recent research results about the different mechanisms, location and relationships of charge carrier recombination in PSCs. After introducing the theoretical framework, including the main transport equations and relations with luminescence techniques, the radiative and non-radiative natures of recombination are commented and compared in terms of main contributions. Also, the effects of changing the perovskite composition and morphology are surveyed. The location of the recombination processes, whether in the bulk material or towards the interface, are tackled, as well as related features with the current-voltage hysteresis. On the latter, and along the complete chapter, the dual ionic-electronic conductivity of hybrid lead halide perovskites is particularly attended. ybrid lead halide perovskites emerged at the beginning of 2010s decade as one of the most promising materials for photovoltaic applications. Easy and low-cost solution-based fabrication processes can be used, obtaining perovskite solar cells (PSCs) with efficiencies above 20%. However, there still are some major issues to overcome, like stability, and the general understanding of the recombination mechanisms results particularly puzzling. In this chapter, an analysis is provided on most recent research results about the different mechanisms, location and relationships of charge carrier recombination in PSCs. After introducing the theoretical framework, including the main transport equations and relations with luminescence techniques, the radiative and non-radiative natures of recombination are commented and compared in terms of main contributions. Also, the effects of changing the perovskite composition and morphology are surveyed. The location of the recombination processes, whether in the bulk material or towards the interface, are tackled, as well as related features with the current-voltage hysteresis. On the latter, and along the complete chapter, the dual ionic-electronic conductivity of hybrid lead halide perovskites is particularly attended.

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