Lancaster: American Physical Society, 1952. 1st Edition. BOUND FULL VOLUME FIRST EDITION OF THE FIRST MODEL OF ELECTRON-HOLE RECOMBINATION IN A HIGHLY PURE SEMICONDUCTOR. Cited over 2500 since publication, this model is now known as the Shockley-Read-Hall (SRH) recombination and is of import to solar and semiconductor technology.
“Any electron which exists in the conduction band is in a meta-stable state and will eventually stabilize to a lower energy position in the valence band. When this occurs, it must move into an empty valence band state. Therefore, when the electron stabilizes back down into the valence band, it also effectively removes a hole. This process is called recombination” (Honsberg & Bowden, Types of Recombination).
The model Shockley and Read put forth in this paper is essentially recombination through defects; in other words, recombination does not happen in a pure material. The steps involved in SRH are two-fold: (1) “An electron (or hole) is trapped by an energy state in the forbidden region which is introduced through defects in the crystal lattice. These defects can either be unintentionally introduced or deliberately added to the material, for example in doping the material; and (2) If a hole (or an electron) moves up to the same energy state before the electron is thermally re-emitted into the conduction band, then it recombines.
“The rate at which a carrier moves into the energy level in the forbidden gap depends on the distance of the introduced energy level from either of the band edges. Therefore, if an energy is introduced close to either band edge, recombination is less likely as the electron is likely to be re-emitted to the conduction band edge rather than recombine with a hole which moves into the same energy state from the valence band. For this reason, energy levels near mid-gap are very effective for recombination” (ibid).
ALSO INCLUDED IN THIS ISSUE: PFIRST EDITION IN ORIGINAL WRAPS OF DONALD GLASER’S NOBEL PRIZE WINNING INVENTION OF THE BUBBLE CHAMBER USED IN SUB ATOMIC PARTICLE PHYSICS.
Glaser was an American physicist and neurobiologist who, inspired by the bubbles in a glass of beer, invented a vessel that, when filled with a superheated transparent liquid like liquid hydrogen, is able to detect electrically charged particles moving through it. Glaser’s bubble chamber made it possible for scientists “to observe the paths and lifetimes of particles” in sub atomic particle physics (Wikipedia). Bubble chambers are created by filling “a large cylinder with a liquid heated to just below its boiling point. As particles enter the chamber, a piston suddenly decreases its pressure, and the liquid enters into a superheated, metastable phase. Charged particles create an ionization track, around which the liquid vaporizes, forming microscopic bubbles. Bubble density around a track is proportional to a particle’s energy loss. Bubbles grow in size as the chamber expands, until they are large enough to be seen or photographed” (Wikipedia). Glaser was awarded the Nobel Prize in 1960 for his invention. Item #553
CONDITION & DETAILS: Lancaster: American Physical Society. Complete full volume. Ex-libris with no spine markings whatsoever. Pictorial bookplate of the Bridgeport Library on the front pastedown; stamp on title page and rear flyleaf. 4to (10.5 x 8 inches; 263 x 200mm). Tightly and solidly bound in brown buckram, gilt-lettered at the spine. Very slight wear.