Invited Speaker, Track 4: Low-Power Electronics for Autonomous Sensors

Yong-Young Noh

Pohang University of Science and Technology (POSTECH), Korea
Presenter Bio

Prof. Yong-Young Noh has been working in the field of materials and device for the development of organic electronics and printed electronics for last 20 years after his undergraduate studies. He
developed a high-resolution patterning process with inkjet printing called “Self-Aligned Printing” and reported the result from Nature Nanotechnology, 2(12) 784 (2007) and transfer the technology to the
company (Plastic Logics co. ltd.). He has published more than 300 papers in various international journals including Nature, Nature Nanotech., Nature Mater., Adv. Mater., IEEE EDL and JACS. In
addition, he holds more than 50 domestic and oversea patents. With these efforts, he has been honored with various awards including IEEE George E. Smith Award (2014), Korea President Award (2014) and Universal Display Corporation (UDC) Pioneer Award for Organic Electronics (2020) from various organizations.

Abstract: Development of high performance halide perovskite transistors and phototransistors
Perovskites have been intensively investigated for their use in solar cells and light-emitting diodes. However, research on their applications in thin-film transistors (TFTs) has drawn less attention despite their high intrinsic charge carrier mobility. In this study, we report the universal approaches for high-performance and reliable p-channel lead-free phenethylammonium tin iodide TFTs. These include self-passivation for grain boundary by excess phenethylammonium iodide, grain crystallisation control by adduct, and iodide vacancy passivation through oxygen treatment. We found that the grain boundary passivation can increase TFT reproducibility and reliability, and the grain size enlargement can hike the TFT performance; thus, enabling the first perovskite-based complementary inverter demonstration with n-channel indium gallium zinc oxide (IGZO) TFTs. In addition, we applied the same transistors for photosensors to detect green light. Details of performance will be discussed in my presentation. The inverter exhibits a high gain over 30 with an excellent noise margin. This work aims to provide widely applicable and repeatable methods to make the gate more open for intensive efforts towards high-performance printed perovskite TFTs.

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