ORCID Profile
0000-0003-1348-4094
Current Organisations
Lam Research (United States)
,
Memorial Sloan Kettering Cancer Center
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Publisher: Wiley
Date: 07-04-2022
Abstract: Transparent electronics are rapidly evolving with the development of transparent conducting oxides (TCOs). This work investigates both the electrical and optical properties of n‐type tin oxide (SnO x ) film, deposited at various levels of oxygen concentration using magnetron sputtering. The band alignment at InP–SnO x interface is further studied and SnO x deposited at various conditions is used to demonstrate InP nanowire (NW) light emitting diodes (LEDs) to understand the trade‐off between absorption and resistance. It is found that the device with lower resistance but higher absorption outperforms in terms of output power. Emission from the devices consists of two peaks at room temperature due to conduction band‐to‐heavy hole band transition and conduction band‐to‐light hole band transition. Decreasing the operating temperature brings about quite a complex transition in all the devices, which consists of two additional peaks due to Zn acceptor level and zincblende/wurtzite (ZB/WZ) recombination at NW/substrate interface. At temperatures below 208 K, the emission peak from conduction band‐to‐light hole band transition quenches, however the emission peaks from Zn acceptor level and ZB/WZ recombination become prominent. This work lays the foundation for realizing a new generation of efficient transparent electrodes in conjunction with NWs, eliminating the complex epitaxial growth process optimization of NW shell growth, heterostructure and doping.
Publisher: American Chemical Society (ACS)
Date: 16-11-2022
Abstract: Carrier-selective contacts have emerged as a promising architecture for solar cell fabrication. In this report, the first hole-selective III-V semiconductor solar cell is demonstrated using copper iodide (CuI) on i-GaAs. Surface passivation quality of GaAs is found to be essential for open-circuit voltage (
Publisher: Springer Science and Business Media LLC
Date: 05-02-2020
DOI: 10.1038/S41588-019-0576-7
Abstract: Chromothripsis is a mutational phenomenon characterized by massive, clustered genomic rearrangements that occurs in cancer and other diseases. Recent studies in selected cancer types have suggested that chromothripsis may be more common than initially inferred from low-resolution copy-number data. Here, as part of the Pan-Cancer Analysis of Whole Genomes (PCAWG) Consortium of the International Cancer Genome Consortium (ICGC) and The Cancer Genome Atlas (TCGA), we analyze patterns of chromothripsis across 2,658 tumors from 38 cancer types using whole-genome sequencing data. We find that chromothripsis events are pervasive across cancers, with a frequency of more than 50% in several cancer types. Whereas canonical chromothripsis profiles display oscillations between two copy-number states, a considerable fraction of events involve multiple chromosomes and additional structural alterations. In addition to non-homologous end joining, we detect signatures of replication-associated processes and templated insertions. Chromothripsis contributes to oncogene lification and to inactivation of genes such as mismatch-repair-related genes. These findings show that chromothripsis is a major process that drives genome evolution in human cancer.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1NH00535A
Abstract: Flexible electronics are gaining rapid popularity in modern day life. We demonstrate a simplified process to make flexible LEDs using p-InP nanowires with conformal coating of ZnO and perform a systematic study.
Location: Korea, Republic of
Location: United States of America
Location: Korea, Republic of
No related grants have been discovered for June-Koo Lee.