EffectofMagneticFieldandTemperatureontheExcess MinorityCarrierDensityintheBaseofaRadialJunction SolarCell
- nano slect , 6 (6) : 1-9
Résumé
Thisstudypresentsatheoreticalanalysisofthecombinedimpactofmagneticfieldandtemperatureonthechargecarrierdensity
inpolycrystallinesiliconradial-junctionsolarcells.Basedonatwo-dimensionalmodel inthetransientdynamicregime, the
continuityequationissolvedusingthemethodofseparationofvariablescombinedwithBessel functions, takingintoaccount
theradialgeometry.Unlikeplanarcells,theradialstructureofsolarcellsallowsthedecouplingoflightabsorptionfromcharge
collection,thusenablingtheuseoflower-puritymaterialswhileimprovingcollectionefficiency.Theresultsshowthattheelectron
densitydecreaseswithincreasingradialdistance.However, itincreaseswiththemagneticfieldintensityuptoathresholdof2
×10−3T.Thiseffect,morepronouncedat largerradii, isexplainedbytheLorentzforce,whichconfinestheelectrons.Carrier
densityalsoincreaseswithtemperature.Nevertheless,withintherangefromB=1×10−4TtoapproximatelyB≈5.6×10−4
T, itbecomesnearlyinsensitivetothermalvariations.Althoughpurelytheoreticalandnotaccountingforcertaineffects(such
assurfacerecombination), thisstudyprovidesarelevantanalytical frameworkforoptimizingradial solarcells.Experimental
validationremainstobeconsidered.
Mots-clés
conversionefficiency|electrondensity|magneticfield|radialjunction|temperature