fig5

Figure 5. (A) Room temperature UV-vis absorption spectrum^[72]; Copyright 2010, American Chemical Society. (B) (i) UV-vis absorption spectrum; (ii) Fluorescence spectra with an excitation wavelength of 260 nm^[58]; Copyright 2017, Wiley-VCH. (C) (i) Band structure; (ii) and (iii) Band contour for the bottom conduction band (upper panel) and the top valence band (lower panel) in the first Brillouin zone^[61]; Copyright 2019; IOP Publishing. (D) Total and orbital-projected density of states (DOS) for Se^[73]; Copyright 2019, American Physical Society. (E) Transfer curves of a Se nanosheet phototransistor measured under various laser irradiation powers at V_ds = 3 V^[57]; Copyright 2017, American Chemical Society. (F) Photocurrent as a function of laser illumination power measured from voltage of -10 V to 10 V^[77]; Copyright 2017, Optical publishing group. (G) Photo response behaviors under lasers with various wavelengths and various laser power densities of dark and levels in 0.5 M KOH at a bias voltage of 0.6 V^[78]; Copyright 2020, Royal society of chemistry. (H) J-V curves of Se-devices annealed at different specific temperatures^[81]; Copyright 2019, Wiley-VCH. (I) (i) Schematic showing the deformed Se nanowire chain and the origin of the piezoelectric polarization; (ii) Short-circuit current (I_sc) of Se-PENGs^[85]; Copyright 2015, Elsevier.