Woo, S. Ryu, G. Kang, S.S. Kim, T.S. Hong, N. Han, J.-H. Chu, R.J. Lee, I.-H. Jung, D. Choi, W.J. 2024-01-19T13:30:27Z 2024-01-19T13:30:27Z 2022-01-10 2021-11-24 1944-8244 https://pubs.kist.re.kr/handle/201004/116115 Current infrared thermal image sensors are mainly based on planar firm substrates, but the rigid form factor appears to restrain the versatility of their applications. For wearable health monitoring and implanted biomedical sensing, transfer of active device layers onto a flexible substrate is required while controlling the high-quality crystalline interface. Here, we demonstrate high-detectivity flexible InAs thin-film mid-infrared photodetector arrays through high-yield wafer bonding and a heteroepitaxial lift-off process. An abruptly graded InxAl1-xAs (0.5 < x < 1) buffer was found to drastically improve the lift-off interface morphology and reduce the threading dislocation density twice, compared to the conventional linear grading method. Also, our flexible InAs photodetectors showed excellent optical performance with high mechanical robustness, a peak room-temperature specific detectivity of 1.21 × 109 cm-Hz1/2/W at 3.4 μm, and excellent device reliability. This flexible InAs photodetector enabled by the heteroepitaxial lift-off method shows promise for next-generation thermal image sensors. ？ 2021 The Authors. Published by American Chemical Society. English American Chemical Society High-Performance Flexible InAs Thin-Film Photodetector Arrays with Heteroepitaxial Growth Using an Abruptly Graded in xAl1- xAs Buffer Article 10.1021/acsami.1c14687 1 ACS Applied Materials & Interfaces, v.13, no.46, pp.55648 - 55655 ACS Applied Materials & Interfaces 13 46 55648 55655 scie scopus 000751884800099 2-s2.0-85119993376 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article epitaxial lift-off heteroepitaxial growth metal wafer bonding mid-infrared molecular beam epitaxy photodetector