Investigations On The Properties Of Copper Indium Gallium Selenide (CIGS) Solar Cells Under Proton Irradiation

In this paper, through the tests of proton irradiation which were carried out onirradiation simulation equipment, irradiation damage of50keV、100keV、150keVproton on CIGS was investigated.By means of I-V curve, quanta efficiency, optical reflectances of CIGS solarcells before and after irradiation, and by SEM, XRD analysis, CIGS solar cellsirradiation properties variation and damage mechanisms were revealed.Through the I-V curve tests, the variation of the short circuit current(Isc), theopen circuit voltage(Voc) and maximum power(Pmax) with the increase of protonirradiation energy and fluence was found out. The variation indicated that protonirradiation makes the CIGS cells electrical properties declined, and when theirradiation fluence is constant, the c ell electrical parameter is more lower if protonenergy is more higher; when the irradiation proton energy is constant, the CIGScell electrical parameter is more lower if the irradiation fluence is greater.The law that proton irradiation affect the series resistance(Rs) and the shuntresistance(Rsh) of CIGS cells was investigated through the dark I-V curves Theresults show that the series resistance was affectetd largely by irradiation energyand fluence the and proton and the shunt Resistance is impacted relatively small.By analyzing the quanta efficiency curves of before and after irradiation, afterirradiation cell quanta efficiency is reduced. The more higher proton irradiationenergy and fluence，the more the reducding is obvious.The tests of optical reflectance illustrated that the CIGS cell surface relectivitybecame more larger with the increase of proton irradiation energy and fluence. Thischanging was in consistent with the law of CIGS cells electrical propertiesdegradation.XRD analysis showed that irradiation defects were introduced into the cells;the higher the proton energy, the more the concentration was and the greater theCIGS cells electrical properties degradation. Moreover, the impact of irradiationenergy on CIGS cells is larger than irradiation fluence.