P-H bonds in the reconstruction of P-rich InP(100) measured with FTIR

Abstract

The reconstruction of P-rich InP(100) requires at least a (2x4) surface unit cell to stay semiconducting and uncharged (electron counting rule). Recently it has been shown that the much smaller (2x2) unit cell obtained from MOCVD (metalorganic vapor deposition) growth contains P-H bonds. Orientation and polarization dependent Fourier Transform Infrared Spectroscopy (FTIR) of the P-H bonds in the Attenuated Total Reflection (ATR) mode have confirmed the specific form of the (2x2) surface unit cell (T. Letzig et al., Phys. Rev. B 71 (2005) 033308) earlier proposed by W.G. Schmidt and coworkers (W.G. Schmidt et al., Phys. Rev. Lett. 90 (2003) 126101). Surface unit cells with a higher concentration of P-H bonds also obey the electron counting rule. A c(2x2) LEED image and two matching FTIR peaks were observed when the (2x2) reconstructed surface was exposed to atomic hydrogen. The corresponding c(2x2)-2P-3H surface unit cell can be shown to form a stable surface phase (T. Letzig et al., Phys. Rev. B, submitted). The complete transformation of the (2x2) surface to this new phase is not observed since the surface deteriorates when exposed to a higher dose of atomic hydrogen.

Facile “Synergistic Inner–Outer Activation” Strategy for Nano‐Engineering of Nature‐Skin–Derived Wearable Daytime Radiation Cooling Materials

“…The absorption peak at ≈2400 cm −1 belonged to the PH group. [ 39 ] In addition, strong absorption peaks were observed in the range of 500–1500 cm −1 . The peak at 980–1300 cm −1 belonged to the stretching mode of the PO and PO bonds, [ 40,41 ] and the wide absorption peak at 585 cm −1 represented the MgO 6 octahedral complex deformation.…”

Association between Land Surface Temperature and Green Volume in Bochum, Germany

“…Green spaces are the most important climate-ecological compensation in urban areas [25] and can offset the effects of SHIs. Physically, evapotranspiration [26] can reduce the land surface temperature (LST) [27] due to heat energy loss during the phase change of water from liquid to gas, thereby reducing the SHI effect. Conversely, LST can increase due to a reduction or absence of vegetation where this process causes a latent heat buildup on urban surfaces [28].…”