The high resolution optical technique combining scanning probe microscopy and optical microscopy has shown its distinct capability in characterizing materials with high sensitivity and topography information [1]. We actively contributes to the development of high resolution optical technique in a variety of aspects [2-4].
In this talk, two topics of our recent research will be presented:
1) Phase-segregation induced bandgap instability in mixed-halide perovskite [4]. We demonstrate that photo-induced phase-segregation preferentially occurs at grain boundaries rather than within the grain centers by using shear-force scanning probe microscopy in combination with confocal optical spectroscopy.
2) Morphology and optical properties of Si and Au nanostructures processed by helium-ion microscopy. Different helium-ion doses are used to produce Si and Au nanostructures. The mechanisms of nanostructure-formation are discussed. The potential morphology and optical property changes due to the interaction with helium ions are investigated.
[1] A. Kern, D. Zhang, M. Brecht, et al., Chem. Soc. Rev., 42 (2014) 965.
[2] a) X. Wang, A. J. Meixner, D. Zhang*, et. al., Adv. Func. Mater., 20 (2010) 492; b) D. Zhang*, U. Heinemeyer, C. Stanciu, et al., Phys. Rev. Lett., 104 (2010) 056601; c) X. Wang, A. J. Meixner, D. Zhang* et al., Small, 7 (2011) 2793. d) P. Anger, A. Feltz, T. Berghaus, et al., J. Microscopy, 209 (2003) 162. e) A. Horneber, K. Braun, A. J. Meixner, D. Zhang* et al., Phys. Chem. Chem. Phys., 17 (2015) 21288 ; f) X. Wang, K. Braun, D. Zhang, A. J. Meixner*, et al., ACS Nano, 9 (2015) 8176.
[3] a) J. Y. Wang, J. Butet, A.-L. Baudrion, A. Horrer, G. Lévêque, O. J. F. Martin, A. J. Meixner, M. Fleischer, P.-M. Adam,* A. Horneber, D. Zhang,* J. Phys. Chem. C, 120 (2016), 17699; b) J. Y. Wang, E. Gürdal, A. Horneber, S. Dickreuter, S. Kostcheev, A. J. Meixner, M. Fleischer, P. M. Adam,* D. Zhang,* Nanoscale, 10 (2018) 8240.
[4] X. F. Tang, M. van den Berg, E. N. Gu, A. Horneber, G. J. Matt, A. Osvet, A. J. Meixner, D. Zhang,* C. J. Brabec*, Nano Lett., 8 (2018) 2172.
Photonic & plasmonic nanomaterials , Optical properties of nanostructures , Enhanced spectroscopy and sensing