Exciton Bohr radius of lead halide perovskites for photovoltaic and light-emitting applications
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866913851000225792 |
|---|---|
| author | Jang, Hyun Myung Jang, Kyung Yeon Lee, Song Hee Park, Jinwoo Lee, Tae-Woo |
| author_facet | Jang, Hyun Myung Jang, Kyung Yeon Lee, Song Hee Park, Jinwoo Lee, Tae-Woo |
| contents | Exciton Bohr radius (a_B) and exciton binding energy (E_b) of metal halide perovskites are two prime quantities in their applications to both light-emitting diode displays and photovoltaic devices. We develop a reliable theoretical method of simultaneously finding a_B and ε_r^c (dielectric constant) based on the net exciton energy above the bulk band gap. It is estimated that a_B under the dielectric confinement is substantially smaller than a_B in the absence of dielectric confinement: 4.36 nm vs. 5.61 nm in the case of CH3NH3PbBr3. We attribute the enhanced a_B to variations of ε_r^c and the electron-hole correlation energy. We also develop a simple method of finding E_b based on the same net exciton energy. Using this, we attribute the well-known difference in E_b between organic bromide perovskites and iodide counterparts to ε_r^c and explain that iodide perovskites are more suited than bromide counterparts in photovoltaic applications, which require smaller E_b for efficient charge-carriers transport. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_15565 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exciton Bohr radius of lead halide perovskites for photovoltaic and light-emitting applications Jang, Hyun Myung Jang, Kyung Yeon Lee, Song Hee Park, Jinwoo Lee, Tae-Woo Materials Science Exciton Bohr radius (a_B) and exciton binding energy (E_b) of metal halide perovskites are two prime quantities in their applications to both light-emitting diode displays and photovoltaic devices. We develop a reliable theoretical method of simultaneously finding a_B and ε_r^c (dielectric constant) based on the net exciton energy above the bulk band gap. It is estimated that a_B under the dielectric confinement is substantially smaller than a_B in the absence of dielectric confinement: 4.36 nm vs. 5.61 nm in the case of CH3NH3PbBr3. We attribute the enhanced a_B to variations of ε_r^c and the electron-hole correlation energy. We also develop a simple method of finding E_b based on the same net exciton energy. Using this, we attribute the well-known difference in E_b between organic bromide perovskites and iodide counterparts to ε_r^c and explain that iodide perovskites are more suited than bromide counterparts in photovoltaic applications, which require smaller E_b for efficient charge-carriers transport. |
| title | Exciton Bohr radius of lead halide perovskites for photovoltaic and light-emitting applications |
| topic | Materials Science |
| url | https://arxiv.org/abs/2505.15565 |