Abstract
Ruddlesden-Popper halide perovskites are 2D solution-processed quantum wells with a general formula A2A' n-1M n X3n+1, where optoelectronic properties can be tuned by varying the perovskite layer thickness (n-value), and have recently emerged as efficient semiconductors with technologically relevant stability. However, fundamental questions concerning the nature of optical resonances (excitons or free carriers) and the exciton reduced mass, and their scaling with quantum well thickness, which are critical for designing efficient optoelectronic devices, remain unresolved. Here, using optical spectroscopy and 60-Tesla magneto-absorption supported by modeling, we unambiguously demonstrate that the optical resonances arise from tightly bound excitons with both exciton reduced masses and binding energies decreasing, respectively, from 0.221 m 0 to 0.186 m 0 and from 470 meV to 125 meV with increasing thickness from n equals 1 to 5. Based on this study we propose a general scaling law to determine the binding energy of excitons in perovskite quantum wells of any layer thickness.
| Original language | English |
|---|---|
| Article number | 2254 |
| Journal | Nature Communications |
| Volume | 9 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Dec 1 2018 |
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ASJC Scopus subject areas
- Chemistry(all)
- Biochemistry, Genetics and Molecular Biology(all)
- Physics and Astronomy(all)
Cite this
Scaling law for excitons in 2D perovskite quantum wells. / Blancon, J. C.; Stier, A. V.; Tsai, H.; Nie, W.; Stoumpos, C. C.; Traoré, B.; Pedesseau, L.; Kepenekian, M.; Katsutani, F.; Noe, G. T.; Kono, J.; Tretiak, S.; Crooker, S. A.; Katan, C.; Kanatzidis, Mercouri G; Crochet, J. J.; Even, J.; Mohite, A. D.
In: Nature Communications, Vol. 9, No. 1, 2254, 01.12.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Scaling law for excitons in 2D perovskite quantum wells
AU - Blancon, J. C.
AU - Stier, A. V.
AU - Tsai, H.
AU - Nie, W.
AU - Stoumpos, C. C.
AU - Traoré, B.
AU - Pedesseau, L.
AU - Kepenekian, M.
AU - Katsutani, F.
AU - Noe, G. T.
AU - Kono, J.
AU - Tretiak, S.
AU - Crooker, S. A.
AU - Katan, C.
AU - Kanatzidis, Mercouri G
AU - Crochet, J. J.
AU - Even, J.
AU - Mohite, A. D.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - Ruddlesden-Popper halide perovskites are 2D solution-processed quantum wells with a general formula A2A' n-1M n X3n+1, where optoelectronic properties can be tuned by varying the perovskite layer thickness (n-value), and have recently emerged as efficient semiconductors with technologically relevant stability. However, fundamental questions concerning the nature of optical resonances (excitons or free carriers) and the exciton reduced mass, and their scaling with quantum well thickness, which are critical for designing efficient optoelectronic devices, remain unresolved. Here, using optical spectroscopy and 60-Tesla magneto-absorption supported by modeling, we unambiguously demonstrate that the optical resonances arise from tightly bound excitons with both exciton reduced masses and binding energies decreasing, respectively, from 0.221 m 0 to 0.186 m 0 and from 470 meV to 125 meV with increasing thickness from n equals 1 to 5. Based on this study we propose a general scaling law to determine the binding energy of excitons in perovskite quantum wells of any layer thickness.
AB - Ruddlesden-Popper halide perovskites are 2D solution-processed quantum wells with a general formula A2A' n-1M n X3n+1, where optoelectronic properties can be tuned by varying the perovskite layer thickness (n-value), and have recently emerged as efficient semiconductors with technologically relevant stability. However, fundamental questions concerning the nature of optical resonances (excitons or free carriers) and the exciton reduced mass, and their scaling with quantum well thickness, which are critical for designing efficient optoelectronic devices, remain unresolved. Here, using optical spectroscopy and 60-Tesla magneto-absorption supported by modeling, we unambiguously demonstrate that the optical resonances arise from tightly bound excitons with both exciton reduced masses and binding energies decreasing, respectively, from 0.221 m 0 to 0.186 m 0 and from 470 meV to 125 meV with increasing thickness from n equals 1 to 5. Based on this study we propose a general scaling law to determine the binding energy of excitons in perovskite quantum wells of any layer thickness.
UR - http://www.scopus.com/inward/record.url?scp=85048306847&partnerID=8YFLogxK
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U2 - 10.1038/s41467-018-04659-x
DO - 10.1038/s41467-018-04659-x
M3 - Article
C2 - 29884900
AN - SCOPUS:85048306847
VL - 9
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
IS - 1
M1 - 2254
ER -