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Hao Zhang

Hao Zhang received his B.S. and M.S. in Chemistry at Tsinghua University in 2007 and 2010. He obtained his Ph.D. in Chemistry at University of Chicago in 2015, followed by a short postdoctoral work at the same place, under the supervision of Prof. Dmitri V. Talapin. He continued his postdoctoral study in Prof. John A. Rogers group at Northwestern University (Apr 2016 to Dec 2018). Hao joined Department of Chemistry at Tsinghua University as an associate professor in Jan 2019. His research interests include surface chemistry-mediated 2D/3D patterning of nanomaterials, integrated optoelectronic devices, and their applications as implantable chemical and biochemical sensors.


Direct Photopatterning and 3D Printing of Colloidal Inorganic Nanocrystals for Their Integration in Optoelectronic and Bioelectronic Devices

Hao Zhang*

* Department of Chemistry, Tsinghua University, Beijing 100084, China (hzhangchem@mail.tsinghua.edu.cn)

 

Abstract

Patterning of colloidal nanocrystals in 2D and 3D formats is critical for their integration in system-level device platforms in both rigid and flexible formats, such as pixelated QLED displays, image sensors, and bioelectronics. However, patterning of nanocrystals with conventional photolithography, one of the enabling techniques in semiconductor industry, suffers from the chemical incompatibility of nanocrystals with the solvents/photoresists and other issues. To address this, direct optical patterning, namely the photolithography without photoresists, have emerged as promising methods to achieve both high-resolution and high-performance in patterned nanocrystal based devices. In this talk, I will first show our recent work on developing photosensitive additives for direct photopatterning and 3D printing of nanocrystals, including perovskites and II-VI quantum dots, via different ligand reaction pathways. The role of photochemistry on the patterning capabilities and optoelectronic performance will be discussed. I will then introduce our recent work on the use of flexible optoelectronic devices in biomodulation at the cell and tissue interfaces. 

References

[1] Lu, S.; Fu, Z.; Li, F.; Weng, K.; Zhou, L.; Zhang, L.; Yang, Y.; Qiu, H.; Liu, D.; Qing, W.; Ding, H.; Sheng, X.; Chen, M.; Tang, X.; Duan, L.; Liu, W.; Wu, L.; Yang, Y.; Zhang, H.; Li, J.: Beyond a Linker: The Role of Photochemistry of Crosslinkers in the Direct Optical Patterning of Colloidal Nanocrystals. Angew. Chem. Int. Ed., Vol. 61, pp. e202202633, 2022.

[2] Liu; D. ; Weng, K.; Lu, S.; Li, F.; Abudukeremu, H.; Zhang, L.; Yang, Y.; Hou, J.; Qiu, H.; Fu, Z.; Luo, X.; Duan, L.; Zhang, Y.; Zhang, H.; Li, J.: Direct Optical Patterning of Perovskite Nanocrystals with Ligand Crosslinkers. Sci. Adv., Vol. 8, pp. eabm8433, 2022.

[3] Fu, Z.; Zhou, L.; Yin, Y.; Weng, K.; Li, F.; Lu, S.; Liu, D.; Liu, W.; Wu, L.; Yang, Y.; Li, H.; Duan, L.; Xiao, H.; Zhang, H.; Li, J.: Direct Photo-Patterning of Efficient and Stable Quantum Dot Light Emitting Diodes via Light-Triggered, Carbocation Enabled Ligand Stripping. Nano Lett., Vol. 23, pp. 2000-2008, 2023.

[4] Li, F.; Liu, S.-F ; Liu, W.; Hou, Z.-W. ; Jiang, J.; Fu, Z.; Wang, S.; Si, Y.; Lu, S.; Zhou, H.; Liu, D.; Tian, X.; Qiu, H.; Yang, Y.; Li, Z.; Li, X.; Lin, L.; Sun, H.-B.; Zhang, H.; Li, J.: 3D Printing of Inorganic Nanomaterials by Photochemically Bonding Colloidal Nanocrystals. Science, Vol. 381, pp. 1468-1474, 2023.