Please use this identifier to cite or link to this item: http://localhost/handle/Hannan/235867
Title: Photoluminescence in Organometal Halide Perovskites: Free Carrier Versus Exciton
Authors: Xiao Yang;Xiaoliang Yan;Yuchen Wang;Wei Chen;Ruizhi Wang;Weiwei Wang;Heng Li;Wanli Ma;ChuanXiang Sheng
Year: 2017
Publisher: IEEE
Abstract: The photoexcitation dynamics in CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> thin films has been studied by nanosecond time-resolved photoluminescence (PL) and transient photoinduced absorption. Under excitation intensity from ~0.1 to ~100 &x03BC;J/cm<sup>2</sup>, free carrier is the dominant photoexcitation species. However, in the intermediate excitation intensity from ~1 to ~10 &x03BC;J/cm<sup>2</sup>, a small fraction of photoexcitations are excitons, which, however, are responsible for PL within this excitation intensity range. The branching ratio between excitons and free carriers at 2 &x03BC;J/cm<sup>2</sup> was estimated to be 17%. Furthermore, the spectral narrowing PL was found at the low temperature after the formation of excitons, indicating that laser action could be due to excitonic emission. Our findings provide fundamental insights into the optical properties of organometal halide perovskites with direct implications for optoelectronics.
URI: http://localhost/handle/Hannan/235867
volume: 7
issue: 2
More Information: 513,
517
Appears in Collections:2017

Files in This Item:
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7782764.pdf349.43 kBAdobe PDF
Title: Photoluminescence in Organometal Halide Perovskites: Free Carrier Versus Exciton
Authors: Xiao Yang;Xiaoliang Yan;Yuchen Wang;Wei Chen;Ruizhi Wang;Weiwei Wang;Heng Li;Wanli Ma;ChuanXiang Sheng
Year: 2017
Publisher: IEEE
Abstract: The photoexcitation dynamics in CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> thin films has been studied by nanosecond time-resolved photoluminescence (PL) and transient photoinduced absorption. Under excitation intensity from ~0.1 to ~100 &x03BC;J/cm<sup>2</sup>, free carrier is the dominant photoexcitation species. However, in the intermediate excitation intensity from ~1 to ~10 &x03BC;J/cm<sup>2</sup>, a small fraction of photoexcitations are excitons, which, however, are responsible for PL within this excitation intensity range. The branching ratio between excitons and free carriers at 2 &x03BC;J/cm<sup>2</sup> was estimated to be 17%. Furthermore, the spectral narrowing PL was found at the low temperature after the formation of excitons, indicating that laser action could be due to excitonic emission. Our findings provide fundamental insights into the optical properties of organometal halide perovskites with direct implications for optoelectronics.
URI: http://localhost/handle/Hannan/235867
volume: 7
issue: 2
More Information: 513,
517
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7782764.pdf349.43 kBAdobe PDF
Title: Photoluminescence in Organometal Halide Perovskites: Free Carrier Versus Exciton
Authors: Xiao Yang;Xiaoliang Yan;Yuchen Wang;Wei Chen;Ruizhi Wang;Weiwei Wang;Heng Li;Wanli Ma;ChuanXiang Sheng
Year: 2017
Publisher: IEEE
Abstract: The photoexcitation dynamics in CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> thin films has been studied by nanosecond time-resolved photoluminescence (PL) and transient photoinduced absorption. Under excitation intensity from ~0.1 to ~100 &x03BC;J/cm<sup>2</sup>, free carrier is the dominant photoexcitation species. However, in the intermediate excitation intensity from ~1 to ~10 &x03BC;J/cm<sup>2</sup>, a small fraction of photoexcitations are excitons, which, however, are responsible for PL within this excitation intensity range. The branching ratio between excitons and free carriers at 2 &x03BC;J/cm<sup>2</sup> was estimated to be 17%. Furthermore, the spectral narrowing PL was found at the low temperature after the formation of excitons, indicating that laser action could be due to excitonic emission. Our findings provide fundamental insights into the optical properties of organometal halide perovskites with direct implications for optoelectronics.
URI: http://localhost/handle/Hannan/235867
volume: 7
issue: 2
More Information: 513,
517
Appears in Collections:2017

Files in This Item:
File SizeFormat 
7782764.pdf349.43 kBAdobe PDF