H-induced modification of dilute nitride semiconductors and control of N-H atomic bonds

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K21007
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Crystal engineering; Electronic materials/Electric materials
• Research Institution: The University of Tokyo
• Principal Investigator: Miyashita Naoya 東京大学, 先端科学技術研究センター, 特任助教 (20770788)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: III-V semiconductor / Dilute nitride / Hydrogen modification / Solar cell

Outline of Final Research Achievements

Hydrogen-related modification of semiconductor properties for MOCVD-grown GaInNAs is one of the important issues for device application. We have proposed a novel approach to incorporate hydrogen into GaInNAs materials to investigate the property modification with no need to consider the unintentional incorporation of impurities such as carbon. We clarified that the hydrogen incorporation induced an increase in unintentional carrier concentration together with generation of defects, which significantly degraded the GaInNAs solar cell performance. Furthermore, we demonstrated that an annealing at nitrogen ambient can remove the hydrogen and resulted in decreases in the carrier concentration and defects. It is thought that the present results will bring an important direction for future development of the GaInNAs devices in the mass-production MOCVD.

Free Research Field

半導体工学、結晶成長、半導体デバイス