ORCID Profile
0000-0001-9765-5246
Current Organisation
University of Rochester
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Publisher: CRC Press
Date: 03-10-2016
Publisher: American Chemical Society (ACS)
Date: 07-02-2020
DOI: 10.1021/JACS.9B13418
Publisher: AIP Publishing
Date: 30-05-2016
DOI: 10.1063/1.4953072
Abstract: We report the large nonlinear response and ultrafast carrier relaxation dynamics of a graphene-Bi2Te3 heterostructure produced by two-step chemical vapour deposition. The nonlinear refractive index reaches n2 = 0.2 × 10−7 cm2/W at the telecommunication wavelength of 1550 nm, which is almost seven orders of magnitude larger than that of the bulk Si material. Additionally, a pump-probe experiment is performed to investigate the ultrafast dynamic process (intraband relaxation time τ1 = 270 ± 20 fs interband relaxation time τ2 = 3.6 ± 0.2 ps) of the graphene-Bi2Te3 heterostructure. Then, based on the donor-acceptor structure model, we propose a theoretical model to explain the dynamic relaxation process. Our results show that the graphene-Bi2Te3 heterostructure is a promising saturable absorber for ultrafast pulse laser applications at telecommunication wavelengths.
Publisher: Springer Science and Business Media LLC
Date: 09-09-2016
DOI: 10.1038/SREP33070
Abstract: We report the ultra-broadband nonlinear optical (NLO) response of Bi 2 Te x Se 3−x nanosheets produced by a facile solvothermal method. Our result show that the extracted basic optical nonlinearity parameters of Bi 2 Te x Se 3−x nanosheets, α NL , Imχ (3) , and FOM reach ~10 4 cm/GW, ~10 −8 esu and ~10 −13 esu cm, respectively, which are several orders of magnitude larger than those of bulk dielectrics. We further observed the excitation intensity dependence of the NLO absorption coefficient and the NLO response sensitivity. The mechanisms of those phenomena were proposed based on physical model. The wavelength dependence of the NLO response of Bi 2 Te x Se 3−x nanosheets was investigated, and we determined that the Bi 2 Te x Se 3−x nanosheets possess an ultra-broadband nonlinear saturable absorption property covering a range from the visible to the near-infrared band, with the NLO absorption insensitive to the excitation wavelength. This work provide fundamental and systematic insight into the NLO response of Bi 2 Te x Se 3−x nanosheets and support their application in photonic devices in the future.
Publisher: Wiley
Date: 10-01-2018
Abstract: The surface composition of perovskite films is very sensitive to film processing and can deviate from the optimal, which generates unfavorable defects and results in efficiency loss in solar cells and slow response speed in photodetectors. An argon plasma treatment is introduced to modify the surface composition by tuning the ratio of organic and inorganic components as well as defect type before deposition of the passivating layer. It can efficiently enhance the charge collection across the perovskite–electrode interface by suppressing charge recombination. Therefore, perovskite solar cells with argon plasma treatment yield enhanced efficiency to 20.4% and perovskite photodetectors can reach their fastest respond speed, which is solely limited by the carrier mobility.
Publisher: American Chemical Society (ACS)
Date: 03-02-2022
DOI: 10.1021/JACS.1C11253
Abstract: Electrochemical CO
No related grants have been discovered for Yongli Gao.