Evidence for correlated hole distribution in neutron-transmutation-doped isotopically controlled germanium

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.7797· OSTI ID:279778

Itoh, K M; Muto, J ^[1]; Walukiewicz, W; Beeman, J W ^[2]; Haller, E E ^[3]; Kim, H; Mayur, A J; Sciacca, M D; Ramdas, A K ^[4]; Buczko, R ^[5]; Farmer, J W ^[6]; Ozhogin, V I ^[7]

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1. Department of Instrumentation Engineering, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223 (Japan)
2. Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)
3. Lawrence Berkeley National Laboratory and University of California at Berkeley, Berkeley, California 94720 (United States)
4. Purdue University, West Lafayette, Indiana 47907 (United States)
5. Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warsaw (Poland)
6. University of Missouri, Columbia, Missouri 65211 (United States)
7. Kurchatov Institute of Atomic Energy, 123182 Moscow (Russia)

We report on low-temperature infrared-absorption spectroscopy studies of compensated {ital p}-type Ge(Ga,As) samples with varying doping compensation ratios. Previous difficulties in preparing appropriate samples are overcome by neutron-transmutation doping of high-purity, isotopically controlled germanium composed exclusively of {sup 70}Ge and {sup 74}Ge, viz. {sup 70}Ge{sub {ital x}} {sup 74}Ge{sub 1{minus}{ital x}}. With this technique, we have produced a series of crystals with compensation ratios between 0.082 and 0.87, while maintaining the net-acceptor concentration [Ga]-[As] constant at 5{times}10{sup 14} cm{sup {minus}3}. The observed excitation lines of Ga acceptors broaden linearly with the ionized impurity concentration due to the quadrupole interactions between Ga bound holes and the electric-field gradient. Experimental linewidths are quantitatively compared with existing theories of electric-field broadening developed in the context of donor transitions. We find excellent agreement with the theory based on the correlated distribution of ionized impurity centers. {copyright} {ital 1996 The American Physical Society.}

• Research Organization: Lawrence Berkeley National Laboratory
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 279778
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 12 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
40 CHEMISTRY
ABSORPTION SPECTRA
ARSENIC ADDITIONS
DONORS
ELECTRIC FIELD EFFECTS
GALLIUM ADDITIONS
GERMANIUM 70
GERMANIUM 74
HOLES
IMPURITIES
INFRARED SPECTRA
MONOCRYSTALS
P-TYPE CONDUCTORS
QUADRUPOLE MOMENTS
STARK EFFECT
SUBSTOICHIOMETRY
TEMPERATURE RANGE 0000-0013 K