No abstract

The change in work function of barium-covered p-and n-type germanium emitters with the degree of coverage 0 is investigated by FEM. The curve of work function q against deposition time is similar to that for barium adsorption on metals. The work functions of clean field-desorbed surfaces of p-and n-type emitters are determined from the Fowler-Nordheim slopes with respect to that for barium-covered surfaces, assuming that the work function of the latter for 0 > 1 is qBa = 2.5 eV. The work functions are qp = (4.90 f0.05)eV and qn = (4.43 f 0.05) eV for ep = 3.7 Rcm and en = 2.5 Qcm, respectively. The difference in the observed work functions compares well with the difference of the Fermi level position. Metallic-like properties of barium on germanium are observed a t coverages 0 much less than a monolayer (0 = 0.007). Mccnenosamie U~M~H~H U B pa6o~bl mxona repMaHun p-M n-Tma n p~l noHpbr-T E~M ero 6 a p~e~, I I O K~~~J I O , YTO ~~B M C E~M O C T~ q(0) EiMeeT TaKo# me xapamep, ICaK npIl ancop6s~i1l 6apncr Ha MeTaJIJIe. El3 OTHOCHTeJlbHblX HaHJIOHOB KpElBblX @aynepa-Hopnrehfa HJIR qUCTbIX EI IIOHphITIJX 6 a p~i e~ (6 > 1) Ge 3MkITTePOB, OnpeJ&JleHa pa6o~a BbIXOna AJIR BMEITTBPOB, H3rOTOBaeHHbIX k13 p-Ei n-TkIna Ge MOHOHpHCTaJIJIOB; Tp = (4,90 & 0,05) eV Ei (Pn = (4,43 f 0,05) e v COOTBeTCTBeH-HO. P~~H O C T~ pa6OT BMxona xopoluo cornacyeTcx c p a a~~i s e t i B nonome-H E~M YPOBHB QepMEi B HCXOAHHX 06passax ep = 3,7 ncm EI en = 2,5 Qcm. 06HapyHteH0, 9TO MeTaJIJIOIIOn06HbIe CBO#CTBa IIOKpblTHa IIpORBJIBIOTCR yHte npEi e = 0,007.

No abstract

A study is made of the behaviour of field-emission current-voltage characteristics in 3.5 item p-type Ge emitters, cleaned by field desorption. Nonlinearity of the Fowler-Pu'ordheim plots, and a contracting field-emission pattern in the region of slow emission current increase are observed. The dependence of the nonlinear effects on the shape of the emitter and the temperature treatment is studied. The behaviour of the current-voltage characteristics is also studied for the case where barium and gold films are deposited on the emitter.It is found that coating a field-emitter with a metallic layer of thickness less than 0.1 monolayers results in the complete removal of the nonlinear effects. A qualitative explanation of these results is given based on the concept of "exhausting" the inversion region near the emitting surface when the emission current is removed. IIpOBeAeHO HCCJIeAOBaHHe BOJIhTaMIlepHbIX XapaKTepHCTHK aBTO3MHCCHOHHOrO TOIEa P-THna rePMaHHR (YneJIbHOe COIIpOTHBJIeHHe 3,s O M . CM) Ha 3MHTTepaX OYH-