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CONSIDERATIONS FOR OPTIMUM DESIGN OF QUANTUM WELL STRUCTURES

IP.com Disclosure Number: IPCOM000025489D
Original Publication Date: 1985-Oct-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 4 page(s) / 110K

Publishing Venue

Xerox Disclosure Journal

Abstract

We propose adjustment of the confined energy levels, En, in a quantum well structure to optimize we1 1 operation. The allowed energy levels for an electron in a potential well is related to the effective mass of an electron Mk, and the width, L, of the well. The number of allowed energy levels that can fit in a potential well is related to MZ, L and Vc. Figure 1 shows the bandgap profile for a single quantum illustrating two energy levels El and E2 in the well. As long as En < Vc, the energy level will be confined to the well. The energy levels in the well may be defined by Equation 1:

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Page 1 of 4

XEROX DISCLOSURE JOURNAL

QUANTUM

CONSIDERATIONS FOR OPTIMUM DESIGN OF QUANTUM WELL STRUCTURES
Robert D. Burnham
Donald R. Scifres
William Streifer

Proposed Classification
U.S. Cl. 148/1.5 Int. C1. HOll 7/00

-

-

VC

WELL

E2

'

El

0

u

c 1003

t

\I BE = 0.36 eV

Eg = 1.42 eV

Volume 10 Number 5 September/October 1985 259

[This page contains 1 picture or other non-text object]

Page 2 of 4

CONSIDERATIONS FOR OPTIMUM DESIGN OF QUANTUM 'WELL STRUCTURES (Cont'd)

We propose adjustment of the confined energy levels, En, in a quantum well structure to optimize we1 1 operation.

The allowed energy levels for an electron in a potential well is related to the effective mass of an electron Mk, and the width, L, of the well. The number of allowed energy levels that can fit in a potential well is related to MZ, L and Vc. Figure 1 shows the bandgap profile for a single quantum illustrating two energy levels El and E2 in the well. As long as En < Vc, the energy level will be confined to the well. The energy levels in the well may be defined by Equation 1:

where n = 1,2,3 ... (Equation 1)

If El and E are as shown in Figure 1, then E3 will not be confined to the well

The band structure for GaAs is shown in Figure 2. The effective mass for the electron depends on where the electrons are located in the conduction bond. The three different effective masses for the electrons are shown in their respective conduction band minima. It is probable that the confined energy levels E,D[oO~~, EnI gO0l or E,l(lll) may be adjusted to particular levels that would optimum devi e 'operation, i.e., energy levels in single and multiple quantum well structures in semiconductor lasers may be designated to enhance laser operation.

- - + .36eV (Equation 2)

since Eg > 6 c.

For example, to adjust EIDl be to would have to satisfy the !oflowing conditions: equal to Elr~loo), the width of the well, L,

352

,* d,2

*

2MeD(OOO)L 24

I...