dielectric mismatch
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Author(s):  
Yongchang Guo ◽  
Bingsuo Zou ◽  
Fan Yang ◽  
Xuan Zheng ◽  
Hui Peng ◽  
...  

In organic–inorganic hybrid lead halide perovskites with a naturally arranged layered structure, the dielectric polarization effect caused by the dielectric mismatch between the organic and inorganic layers takes effect in their optical responses.


2021 ◽  
Vol 93 (1) ◽  
pp. 10401
Author(s):  
Abdelali Talbi ◽  
Mohamed El Haouari ◽  
Khalid Nouneh ◽  
El Mustapha Feddi ◽  
Mohammed Addou

Understanding the behavior of single dopant in semiconductors is a challenge to attain a high control on optoelectronic devices. Based on the fact that the external perturbations have an important impact on properties of doped nanocrystals, we have studied the simultaneous effects of phonons and conduction band non-parabolicity combined to dielectric mismatch and donor position on the photoionization cross section of an off-center donor in spherical GaN/InN core-shell quantum dots. The calculations were carried out within the framework of the effective-mass approximation and the eigenvalues equation has been solved using the Ritz variational method. The examination of the photoionization cross section, corresponding to the first donor energy level and the non-parabolic conduction band optical transition, shows clearly that the existence of non-parabolicity band or dielectric environment causes a blue shift of resonance peaks while the existence of phonon red shift them with a non-neglected variations in their intensity. The donor position has also an important effect on peaks position and amplitude.


ACS Nano ◽  
2019 ◽  
Vol 13 (8) ◽  
pp. 9298-9305 ◽  
Author(s):  
Trung Dac Nguyen ◽  
Monica Olvera de la Cruz
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2019 ◽  
Vol 52 (2) ◽  
pp. 535-546 ◽  
Author(s):  
Ha-Kyung Kwon ◽  
Boran Ma ◽  
Monica Olvera de la Cruz

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