@article{wang_wang_dougherty_2020, title={Direct molecular quantification of electronic disorder in N,N '-Di-[(1-naphthyl)-N,N '-diphenyl]-1,1 '-biphenyl)-4,4 '-diamine on Au(111)}, volume={38}, ISSN={["2166-2754"]}, DOI={10.1116/6.0000401}, abstractNote={Organic light-emitting diodes are important in display applications, but thin films used in these devices often exhibit complex and highly disordered structures. We have studied the adsorption of a typical hole transport material used in such devices, N,N′-Di-[(1-naphthyl)-N,N′-diphenyl]-1,1′-biphenyl)-4,4′-diamine (α-NPD), on the Au(111) surface. Scanning tunneling microscopy images reveal the appearance of different conformations in the first monolayer with submolecular resolution. Scanning tunneling spectra identify the highest occupied molecular orbital on several different adsorption structures. We directly compare the statistical distribution of this orbital energy between an ordered monolayer structure and a disordered bilayer structure of α-NPD on Au(111). The disordered structure exhibits a very broad distribution that is consistent with inferences from prior organic device studies and that we propose arises from minor conformational variations.}, number={5}, journal={JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B}, author={Wang, Jiuyang and Wang, Jingying and Dougherty, Daniel B.}, year={2020}, month={Sep} }
 @article{wang_zhang_liu_mclaughlin_zhai_vardeny_liu_mcgill_semenov_guo_et al._2019, title={Spin-optoelectronic devices based on hybrid organic-inorganic trihalide perovskites}, volume={10}, ISSN={["2041-1723"]}, DOI={10.1038/s41467-018-07952-x}, abstractNote={Abstract}, journal={NATURE COMMUNICATIONS}, author={Wang, Jingying and Zhang, Chuang and Liu, Haoliang and McLaughlin, Ryan and Zhai, Yaxin and Vardeny, Shai R. and Liu, Xiaojie and McGill, Stephen and Semenov, Dmitry and Guo, Hangwen and et al.}, year={2019}, month={Jan} }
 @article{wang_zhang_liu_liu_guo_sun_vardeny_2019, title={Tunable Spin Characteristic Properties in Spin Valve Devices Based on Hybrid Organic-Inorganic Perovskites}, volume={31}, ISSN={["1521-4095"]}, DOI={10.1002/adma.201904059}, abstractNote={Abstract}, number={41}, journal={ADVANCED MATERIALS}, author={Wang, Jingying and Zhang, Chuang and Liu, Haoliang and Liu, Xiaojie and Guo, Hangwen and Sun, Dali and Vardeny, Zeev Valy}, year={2019}, month={Oct} }
 @article{wang_deloach_jiang_papa_myahkostupov_castellano_liu_dougherty_2017, title={Tuning interfacial spin filters from metallic to resistive within a single organic semiconductor family}, volume={95}, ISSN={2469-9950 2469-9969}, url={http://dx.doi.org/10.1103/PhysRevB.95.241410}, DOI={10.1103/physrevb.95.241410}, abstractNote={Jingying Wang,1 Andrew Deloach,1 Wei Jiang,2 Christopher M. Papa,3 Mykhaylo Myahkostupov,3 Felix N. Castellano,3 Feng Liu,2 and Daniel B. Dougherty1,* 1Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202, USA 2Department of Material Science and Engineering, University of Utah, Salt Lake City, Utah 84112, USA 3Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA (Received 6 January 2017; revised manuscript received 26 May 2017; published 30 June 2017)}, number={24}, journal={Physical Review B}, publisher={American Physical Society (APS)}, author={Wang, Jingying and Deloach, Andrew and Jiang, Wei and Papa, Christopher M. and Myahkostupov, Mykhaylo and Castellano, Felix N. and Liu, Feng and Dougherty, Daniel B.}, year={2017}, month={Jun} }
 @article{wang_dougherty_2015, title={Indirect coupling of an organic semiconductor to a d-orbital surface state}, volume={92}, ISSN={["1550-235X"]}, DOI={10.1103/physrevb.92.161401}, abstractNote={Adsorption of the organic semiconductor perylene tetracarboxylic dianhydride onto $\mathrm{Cr}(001)$ decreases the metal $d$-derived surface-state lifetime without causing a shift in its energy. This suggests an indirect electronic interaction that contrasts sharply with expectations of p-d electronic coupling based on direct chemisorption. Lifetime changes are measured with scanning tunneling spectroscopy as a function of temperature and quantified as arising from a molecule-induced increase in electron-electron scattering rate into bulk bands within Fermi-liquid theory. Adsorbate-induced effects extend far beyond the adsorption site of the molecule, decaying exponentially away with a characteristic length scale of $\ensuremath{\sim}2.4\phantom{\rule{0.16em}{0ex}}\mathrm{nm}$, similar to the carrier mean free path in Cr.}, number={16}, journal={PHYSICAL REVIEW B}, author={Wang, Jingying and Dougherty, Daniel B.}, year={2015}, month={Oct} }
 @article{hewitt_wang_boltersdorf_maggard_dougherty_2014, title={Coexisting Bi and Se surface terminations of cleaved Bi2Se3 single crystals}, volume={32}, number={4}, journal={Journal of Vacuum Science & Technology. B, Microelectronics and Nanometer Structures}, author={Hewitt, A. S. and Wang, J. Y. and Boltersdorf, J. and Maggard, P. A. and Dougherty, D. B.}, year={2014} }
 @article{xu_hewitt_wang_guan_boltersdorf_maggard_dougherty_gundogdu_2014, title={Intrinsic and extrinsic effects on the electrostatic field at the surface of Bi2Se3}, volume={116}, number={4}, journal={Journal of Applied Physics}, author={Xu, C. and Hewitt, A. and Wang, J. Y. and Guan, T. S. and Boltersdorf, J. and Maggard, P. A. and Dougherty, D. B. and Gundogdu, K.}, year={2014} }
 @article{wang_hewitt_kumar_boltersdorf_guan_hunte_maggard_brom_redwing_dougherty_2014, title={Molecular Doping Control at a Topological Insulator Surface: F-4-TCNQ on Bi2Se3}, volume={118}, ISSN={["1932-7447"]}, DOI={10.1021/jp412690h}, abstractNote={Recent electrical measurements have accessed transport in the topological surface state band of thin exfoliated samples of Bi2Se3 by removing the bulk n-type doping by contact with thin films of the molecular acceptor F4-TCNQ. Here we report on the film growth and interfacial electronic characterization of F4-TCNQ grown on Bi2Se3. Atomic force microscopy shows wetting layer formation followed by 3D island growth. X-ray photoelectron spectroscopy is consistent with this picture and also shows that charge transferred to the molecular layer is localized on nitrogen atoms. Ultraviolet photoelectron spectroscopy shows a work function increase and an upward shift of the valence band edge that suggest significant reduction in carrier density at the Bi2Se3 surface.}, number={27}, journal={JOURNAL OF PHYSICAL CHEMISTRY C}, author={Wang, J. and Hewitt, A. S. and Kumar, R. and Boltersdorf, J. and Guan, T. and Hunte, F. and Maggard, P. A. and Brom, J. E. and Redwing, J. M. and Dougherty, D. B.}, year={2014}, month={Jul}, pages={14860–14865} }