Graded Bandgap Solar Cells

reportActive / Technical Report | Accession Number: ADA211537 | Open PDF

Abstract:

This program has emphasized investigations of graded bandgap solar cells. The key objective was to determine the feasibility of obtaining high efficiencies with a graded emitter heterojunction structure. The AlxGa1-x As ternary system was selected for actual device fabrication and characterization. Interpretation of photoresponse data for graded devices indicated that the minority carrier diffusion length was essentially zero for x equal to or greater than .25. This property of the AlGaAs films made it impossible to obtain the expected photocurrent from the graded devices. However, studies were carried out which clearly indicated that the structures with graded emitters were characterized by an enhanced photoresponse relatice to homojunction devices.

Author(s):
Olsen, Larry C.
Author Organization(s):
WASHINGTON UNIV SEATTLE
Descriptive Note:
Final rept. 1 Sep 1984-30 Sep 1988
Pagination:
0041

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFOSR-TR-89-1186
Contract/Grant Number(s):
AFOSR-84-0355
Task Number(s):
A7
Project Number(s):
2301
Monitor Series:
TR-89-1186
 Subject Terms
Joint Capability Areas:
JCA_5_Command and Control; JCA_5.3_Planning; JCA_1_Force Support; JCA_6.4.1_Secure Information Exchange; JCA_6_Net Centric; JCA_1.2.5_Lessons Learned; JCA_1.2_Force Preparation; JCA_6.4_Information Assurance
Modernization Areas:
Microelectronics
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*SOLAR CELLS, EFFICIENCY, CHARGE CARRIERS, PHOTOSENSITIVITY, DIFFUSION, TERNARY COMPOUNDS, EMITTERS, HETEROJUNCTIONS, LENGTH
Field(s)/Group(s):
Electrochemical Energy Storage
Keyword(s):
PE61102F, WUAFOSR2301A7
Report Date:
1989 Jun 01