Electron Holography Studies of Cadmium Telluride (CdTe)

2018 Fiscal Year Research-status Report

• Project/Area Number: 18K04247
• Research Institution: Okinawa Institute of Science and Technology Graduate University
• Principal Investigator: CASSIDY Cathal 沖縄科学技術大学院大学, 量子波光学顕微鏡ユニット, 研究員 (40792156)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: CdTe / holography / semiconductor / device / microscopy

Outline of Annual Research Achievements

I spent most effort on Phase 1 of the project, as planned, and made significant progress.
I developed methodologies for FIB, cryoFIB and in situ treatment of CdTe lamellae. I obtained successful samples with optimized conditions. I was able to control the surface condition of the specimens, and obtain samples with reduced density of crystalline dislocations. These samples allowed me to acquire first atomic resolution electron holograms. Further work is ongoing.
I also began some preliminary work on Phase 2 (simulations). I set up the software environment, and began dynamical simulations of electron wave propagation through <110> oriented CdTe.
I gave an invited talk at the Takahashi group at the Kavli Institute for Physics and Mathematics of the Universe (IPMU) at the University of Tokyo. We are trying to initiate a collaboration and hope to get it running this year.

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

Phase 1 & 2 running well. Preparations laid for Phases 3 & 4.

Strategy for Future Research Activity

My main activities in FY2019 will be working on simulations, and experimental optimization. To achieve this goal, a key activity will be attendance at the CCEM electron microscopy workshop at McMaster University (Canada), to gain training on both simulations and experimental hardware optimization.

Causes of Carryover

Costs were lower than expected this year. Phase 1 and 2 proceeded very satisfactorily without needing much extra materials, and there was no appropriate workshop in this time period, so travel costs were low. Significant cost will be incurred in the next fiscal year (in particular, the workshop of highest relevance to this project will take place in June 2019). Furthermore, we are currently trying to begin a collaboration, on this subject, with the Kavli Institute in University of Tokyo, and thus budget may be reallocated for travel costs in FY2019 for visits to University of Tokyo..