التفاصيل البيبلوغرافية
| العنوان: |
Role of the A‑Site Cation in Low-Temperature Optical Behaviors of APbBr 3 (A = Cs, CH 3 NH 3 ) |
| المؤلفون: |
Hongsun Ryu (8654769), Hye Ryung Byun (4522018), Kyle M. McCall (3955226), Dae Young Park (4333375), Tae Jung Kim (3829750), Mun Seok Jeong (1494691), Mercouri G. Kanatzidis (1350288), Joon I. Jang (1637167) |
| سنة النشر: |
2021 |
| المجموعة: |
Smithsonian Institution: Digital Repository |
| مصطلحات موضوعية: |
Biophysics, Biochemistry, Medicine, Biotechnology, Evolutionary Biology, Infectious Diseases, Environmental Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, CsPbBr 3, CH 3 NH 3 PbBr 3, Low-Temperature Optical Behaviors, PL, prototype halide perovskites, 10 K, CH 3 NH 3, P-band, APbBr 3, excitation, phase, exciton binding energies |
| الوصف: |
APbBr 3 (A = Cs, CH 3 NH 3 ) are prototype halide perovskites having bandgaps of 2.30–2.35 eV at room temperature, rendering their apparent color nearly identical (bright orange but opaque). Upon optical excitation, they emit bright photoluminescence (PL) arising from carrier recombination whose spectral features are also similar. At 10 K, however, the apparent color of CsPbBr 3 becomes transparent yellow, whereas that of CH 3 NH 3 PbBr 3 does not change significantly due to the presence of an indirect Rashba gap. With increasing the excitation level, evolution of the PL spectra, which are excitonic at 10 K, reveals the emergence of P-band emission arising from inelastic exciton–exciton scattering. Based on the spectral location of the P-band, exciton binding energies are determined to be 21.6 ± 2.0 and 38.3 ± 3.0 meV for CsPbBr 3 and CH 3 NH 3 PbBr 3 , respectively. Intriguingly, upon further increase in the exciton density, electron–hole plasma appears in CsPbBr 3 as evidenced by both red-shift and broadening of the PL. This phase, however, does not occur in CH 3 NH 3 PbBr 3 presumably due to polaronic effects. Although the A-site cation is believed not to directly impact optical properties of APbBr 3 , our results underscore its critical role, which destines different high-density phases and apparent color at low temperatures. |
| نوع الوثيقة: |
article in journal/newspaper |
| اللغة: |
unknown |
| Relation: |
https://figshare.com/articles/journal_contribution/Role_of_the_A_Site_Cation_in_Low-Temperature_Optical_Behaviors_of_APbBr_sub_3_sub_A_Cs_CH_sub_3_sub_NH_sub_3_sub_/13650976 |
| DOI: |
10.1021/jacs.0c11980.s001 |
| الاتاحة: |
https://doi.org/10.1021/jacs.0c11980.s001 |
| Rights: |
CC BY-NC 4.0 |
| رقم الانضمام: |
edsbas.2AB2FCCB |
| قاعدة البيانات: |
BASE |