Lab of the Month: September 2018

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 Caption 1: Dr Hieu Nguyen (second right) and PhD students Mike Tebyetekerwa (first left), Thien Truong (second left), Rabin Basnet (third left) and honour student Zhuofeng Li (far right).

Caption 1: Dr Hieu Nguyen (second right) and PhD students Mike Tebyetekerwa (first left), Thien Truong (second left), Rabin Basnet (third left) and honour student Zhuofeng Li (far right).

Photovoltaics (PV) research at the Australian National University (ANU) is at the global cutting edge, spanning the entire spectrum of solar electricity technologies - from solar forecasting, to fabricating high-efficiency PV cells, to integrating renewables with storage capacity into the grid. Dr Hieu Nguyen received his PhD (PV) from the ANU under the supervision of Prof Daniel Macdonald in 2016. Since then, he has been a research fellow and lecturer at the same university.

The central idea of his research is to promote and advance the field of luminescence spectroscopy and imaging through knowledge and scientific discoveries, and technique inventions. His team, as a sub-group of the PV group at the ANU, explore fundamental properties of light emitted from photovoltaic materials and devices under various conditions. They work to uncover the relationship between the emitted light and the important properties of the materials and devices, including optical, electrical, chemical, and structural properties. By exploiting these photons, the team also develop novel Raman/luminescence-based characterisation techniques with applications to renewable energy and material science.

In their labs, they integrate the Linkam THMS600 with a confocal Horiba Raman/luminescence spectrometer and a confocal time-resolved photoluminescence system. These tools allow them to probe optoelectronic properties of numerous photovoltaic materials spanning crystalline silicon, amorphous silicon, SiNx, perovskites, transition-metal dichalcogenides (TMDs), etc. at both material and device levels. The team have made numerous original and significant contributions to fundamental understandings of interactions between light and materials/defects in the PV field.

You can find some of their recent publications here:

[1] L. Zhang, A. Sharma, Y. Zhu, Y. Zhang, B. Wang, M. Dong, H.T. Nguyen, Z. Wang, B. Wen, Y. Cao, B. Liu, X. Sun, J. Yang, Zi. Li, A. Kar, Y. Shi, D. Macdonald, Z. Yu, X. Wang, Yuerui Lu, Efficient and Layer‐Dependent Exciton Pumping across Atomically Thin Organic–Inorganic Type‐I Heterostructures, Advanced Materials, (2018) 1803986.

[2] T. Rahman, H. T. Nguyen, A. Tarazona, J. Shi, Y.-J. Han, E. Franklin, D. Macdonald, S. A .Boden, Characterization of Epitaxial Heavily Doped Silicon Regions Formed by Hot-Wire Chemical Vapor Deposition Using Micro-Raman and Micro-photoluminescence Spectroscopy, IEEE Journal of Photovoltaics, 8 (2018) 813-819.

[3] H. T. Wu, H. T. Nguyen, A. Y. Liu, D. Macdonald, Reconstructing Photoluminescence Spectra at 79K from Heavily Boron Doped Regions of Crystalline Silicon Solar Cells, Progress in Photovoltaics: Research and Applications, 26 (2018) 587–596.