Arizona State University

Stephen T Schaefer

Yong-Hang Zhang

Shane R Johnson

Rajeev Reddy Kosireddy

Marko S Milosavljevic

Jia Ding

Zheng Ju

Xin Qi

Tyler Mccarthy

Contacts for solar cells and other optoelectronic devices are provided. Embodiments described herein take advantage of the surface Fermi level pinning effect to build an electrical field inside of a semiconductor to extract or inject carriers for solar cells, photodetectors, and light-emitting device applications. For example, n-type or p-type two-dimensional (2D) materials can be used in contact with an n-type semiconductor to form a 'p-region' so that a p-n junction, or an i-n or n-n+ junction can be constructed. Similarly, n-type or p-type 2D materials can be used in contact with a p-type semiconductor to form an “n-region” so that an n-p junction, or an i-p or p-p+ junction can be constructed. These structures can provide sufficiently high electrical field inside the semiconductor to extract photogenerated carriers in solar cells and photodetectors or inject minority carriers for light-emitting devices.

Contacts of solar cells and other optoelectronic devices

The invention relates in part to a growth model for the growth of Group III-Group V (III-V) alloys by molecular beam epitaxy (MBE) based on the kinetics of adsorption, desorption, incorporation, anion exchange, anion-assisted removal, and surface droplet accumulation of the Group V elements. The invention also relates to methods to optimize MBE growth conditions used to produce a target III-V alloy composition. The invention is further related to methods of predicting III-V alloy compositions resulting from a set of MBE growth conditions.

Kinetic model for molecular beam epitaxy growth of III-V bismide alloys

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Tempe, AZ, United States of America

Stephen T Schaefer