Reduced Optical Gain Threshold by Carrier Multiplication in Semiconductor Perovskite Nanocrystals
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866914448663379968 |
|---|---|
| author | Zhang, Zhen Sun, Encheng Li, Jian Zhang, Chunfeng Hu, Fengrui Xiao, Min Wang, Xiaoyong |
| author_facet | Zhang, Zhen Sun, Encheng Li, Jian Zhang, Chunfeng Hu, Fengrui Xiao, Min Wang, Xiaoyong |
| contents | Carrier multiplication (CM) describes a strong charge-carrier interaction process in semiconductor colloidal nanocrystals (NCs), wherein two band-edge excitons are simultaneously created by an absorbed photon with at least twice the bandgap energy (2 Eg). While being fundamentally intriguing, it has been exclusively utilized to enhance the light-to-electricity conversion efficiencies in the photodetector and solar-cell devices. In this report, we have synthesized the core/shell perovskite FAPbI3/NdF3 NCs with a biexciton recombination lifetime of ~3.9 ns, and demonstrated that a CM efficiency of ~25.7% can be achieved under the ~355 nm laser excitation (~2.21 Eg). This CM occurrence leads to a two-fold reduction in the optical gain threshold, as compared to that obtained under the ~640 nm laser excitation (~1.23 Eg). When combined with the single-exciton and zero-threshold optical gain schemes previously developed for semiconductor colloidal NCs, the CM effect introduced here would further mitigate the optical-pumping requirement for the routine operation of continuous-wave lasing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_04628 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Reduced Optical Gain Threshold by Carrier Multiplication in Semiconductor Perovskite Nanocrystals Zhang, Zhen Sun, Encheng Li, Jian Zhang, Chunfeng Hu, Fengrui Xiao, Min Wang, Xiaoyong Optics Mesoscale and Nanoscale Physics Carrier multiplication (CM) describes a strong charge-carrier interaction process in semiconductor colloidal nanocrystals (NCs), wherein two band-edge excitons are simultaneously created by an absorbed photon with at least twice the bandgap energy (2 Eg). While being fundamentally intriguing, it has been exclusively utilized to enhance the light-to-electricity conversion efficiencies in the photodetector and solar-cell devices. In this report, we have synthesized the core/shell perovskite FAPbI3/NdF3 NCs with a biexciton recombination lifetime of ~3.9 ns, and demonstrated that a CM efficiency of ~25.7% can be achieved under the ~355 nm laser excitation (~2.21 Eg). This CM occurrence leads to a two-fold reduction in the optical gain threshold, as compared to that obtained under the ~640 nm laser excitation (~1.23 Eg). When combined with the single-exciton and zero-threshold optical gain schemes previously developed for semiconductor colloidal NCs, the CM effect introduced here would further mitigate the optical-pumping requirement for the routine operation of continuous-wave lasing. |
| title | Reduced Optical Gain Threshold by Carrier Multiplication in Semiconductor Perovskite Nanocrystals |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2604.04628 |