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Research Article

Enhanced Band Edge Luminescence in GaAs with Sulfur Passivation

, , , , , , , , , & show all
Pages 47-54 | Received 12 Oct 2020, Accepted 15 Feb 2021, Published online: 23 Sep 2021
 

Abstract

In this work, we perform a sulfur chemical passivation on GaAs substrate, which leads to a change in the photoluminescence (PL) owing to a reduction of surface states. By varying the reaction time of passivation, we can modify the chemical bonds of the GaAs surface and reduce the surface depletion region thickness, which strongly affects the emission efficiency of the GaAs band edge. Based on systematic PL measurements and energy band model with surface states, the sulfur passivation also enhances the number of free and bound excitons. Therefore, sulfur passivation is important to improve the performance of GaAs-based optoelectronics devices.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (62074018, 61704011), the China Postdoctoral Science Foundation funded project (2019M652176, 2019M661680), the Foundation of the State Key Laboratory of High Power Semiconductor Lasers, the Developing Project of Science and Technology of Jilin Province (20200301052RQ, 20180519017JH, 20180520177JH) and the Shenzhen Fundamental Research Fund (JCYJ20180307151538972), the Natural Science Foundation of Guangdong Province (2020A1515010868).

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