Search for Photoinduced Dipoles at Heterojunction Interfaces
We tried to apply the mechanism of surface photovoltage (SPV) to a particular class of semiconductor heterojunctions, those having staggered gaps, with the aim of photoinducing charges of opposite sign at the interface notches and of creating a dipole that modifies the band discontinuities. We performed photoemission experiments at room temperature and at low temperature on the Si/InP(110) heterojunction for a thin coverage of silicon on n-doped and p-doped InP substrates. We found a shift of all the electronic features (both from Si and from InP) to higher binding energies at low temperature when using the n-type InP. No shifts were observed for p-type InP, where we expected to find a photoinduced interface dipole and a consequent shift in opposite directions of Si and InP structures. The implications of these results are discussed.
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Univ wisconsin,ctr synchrotron radiat,madison,wi 53706. ecole polytech fed lausanne,ch-1015 lausanne,switzerland. Dellorto, t, cnr,ist struttura mat,via e fermi 38,i-00044 frascati,italy.
ISI Document Delivery No.: KW458
Record created on 2006-10-03, modified on 2016-08-08