Low energy proton irradiated solar cells using sun simulato

Denney, J. M.

English

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* .L . - I +--+ J 
- S P A C E  T E C H N O L O o Y  L A B O R i T O R I E S  
THOMPSON R A M 0  WOOLORlOGE INC. 
O N E  S P A C E  P A R K  R E D O N O O  B E A C U .  C A L I F O R N I A  
19 February 1965 
N a t i o n e l  Aeronautics and Space Administration 
Goddard Smce Fl iaht  Center - 
Glen D a l e - R o a d  
Greenbelt, Maryland 
Attention: Mr. M. Schach 
Code 633 
Subject: Monthly Progress Report 
N65-20653 
(CODE1 
(33 
UZATEGORYI 
Period Ending 1 February 1965 
Contract N A S ~ -  3805 
R e p o r t  No. 4161- 6010-SU- 000 
Hard copy (HC) 
Microfiche (MF) 
I. Progress in This  R e p o r t  Period 
D e t a  have been obtained on the I-V character is t ics  of' the  solar 
ce l l s  irradiated in low energy proton experiment, using the  STL OCLI sun 
simulator. Colnparlson of the short c i rcu i t  curpent under the  sun 
simulator r e l a t ive  t o  the  short  c i rcui t  observed under 2800~ tungsten 
illumination yields some interesting observations. 
accepted f a c t  that in the  case of so l a r  cells with uniform defect 
densit ies,  the short c i r cu i t  current degradation rate under 28000 
tungsten illumination is approximately 62 ma/cm2 - decade while under 
s o l a r  illuminetion the  degradation rate is appraximstely 4s ms/cm2 - 
decade, In the case of low energy proton irradiated ce l l s ,  however, 
the degradation rates increase considerably as was indicated in lest 
month's progress report. 
lower, resul t ing in defects being produced predomjnantly near the  surface, 
the  percentage degradation in short c i rcu i t  current gradually becomes 
greater under solar i l lumh%tion  than under tungsten i l lumlmtian. A t  
approximately 300 kev the  degradation rate under solar i l l m i m t i o n  is 
almost twice that observed under 2800~ tungsten illumination. 
the nature of the defect density gradient, t h i s  effect was anticipated, 
but the magnitude of t he  e f fec t  is somewhat startling. 
It is a w e l l  
In addition, as t he  proton energy becomes 
Drae t o  
Measurements of the low energy proton irradiated solar ce l l s  
several  w e e k s  after the experiment indicated that considerable annealing 
had occurred in both t h e  p/n and the n/p specimens, considerably more 
than had ever been observed before i n  such a short period of t i m e  f o r  
any electron or proton i r radiat ions previously performed,\ Since these 
1 
REDONW EEACn FACILITIES. 679-6711. AREA C O M  213 
https://ntrs.nasa.gov/search.jsp?R=19650011052 2020-03-17T00:30:46+00:00Z
Mr* M. Schach 
Goddard Space Fl ight  Center 
-2- 
observed high rates of annealing appear inconsistent w i t h  previous date, 
further measurements w i l l  be made on these specimens as a function of 
time t o  confirm the observations. 
A d d i t i o n a l  specimens have been received for the future l o w  energy 
proton and electron experiments. 
Shell O i l  Company t o  u t i l i ze  the i r  3 Mev electron Van de Graaff in 
Emeryville, California. 
i n  the energy transfer from 1 t o  3 Mev in the next report period. In 
addition, repairs and modifications are continuing on the equipment 
involved in the low energy proton experiments i n  order that more data 
may be obtained in the near future. 
Arrangements have been made with the 
Experiments w i l l  be conducted on th i s  machine 
I1 Anticipated Activities During the Next Report Period 
A n  experiment w f l l  be conducted on the Shell O i l  3 MeV electron 
Van de Graaff i n  Emeryville, California. The experiment w i l l  consist 
of irradiating a number of H a l l  specimens i n  order t o  determine the 
energy dependence of the defect introduction rates of the E, -0.17, 
GA linac. 
E -0.40, and +O.Zg levele. In addition, several solar specimens 
w f l l  be t o  cross check with previous data obtained on the 
111. bbqower Expended in  This Repor t  Period 
MANp(swER EXPENDITURES 
NAS5 - 3805 
Period 3 January - 31 January 1965 
Total 
J. R. Carter 
R. G. Downing 
Total 
136 
46 
182 
3
Respectfully submitted, 
m4QL7 
R. G. Downing 
Pro Sect Manager 
J. Ikmey, Direct r 
RGD:mer S o l i &  S t a t e  Wysics hboratory 


<effects of low energy proton irradiation on solar cells< monthly progress report, jan. 1965

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