Performance of heterojunction cellsIt is closely related to its structure and process. Among them,Film thicknessis an important parameter, which directly affectsPhotoelectric conversion rate of heterojunction cells. Hence the researchEffect of thin film thickness on photoelectric conversion rate of heterojunction cellsForOptimize design and increase efficiencyIt is of great significance. Meineng SolarIn order to help battery manufacturers accurately detectFilm thicknessproducedMeineng Poly** Film Thickness Tester,The device relies on industry-leadingInnovative technology for optical measurement,UtilizationPrinciple of optical interference,Scientific and intuitive analysisFilm thickness, optical constantand other performance parameters. Today, Xiaomei will popularize it for youEffect of thin film thickness on photoelectric conversion rate of heterojunction cells
How heterojunction solar cells work
How heterojunction solar cells workYesSunlightirradiationThe surface of the batteryWhen part of the light is coveredITO Thin Film Reflection,Part of the light quiltAmorphous silicon filmsabsorption, partial light penetrationAmorphous silicon filmsArrivedCrystalline silicon substrate. InCrystalline silicon substrate. Medium,PhotonsExcite outElectron-hole pairs, electrons and holesRespectivelyN-type and p-type areasDiffusion, formationBuilt-in electric field. InHeterojunctions of amorphous silicon thin films and crystalline siliconDue toCan be mismatched,formedEnergy level steps,HinderedRecombination of carriers,improvedSeparation efficiency of electrons and holes. InAmorphous silicon films, due to doping, formedp-n knot,Further strengthenedBuilt-in electric field. Finally,Electrons and holesPassedITO thin film and metal electrodesis collected, formedCurrent and voltage,ImplementationPhotoelectric conversion.
Structural schematic diagram of a heterojunction cell.
Effect of thin film thickness on the optical properties of heterojunction cells
Optical properties of heterojunction cellsMainly include:Light transmittance, reflectance and absorption, etcTogether, they decideHeterojunction cellsofLight harvesting capacity and the amount of photogenerated carriers generated. Film thicknessto the batteryOptical performancehas an important impact.
Effect of film thickness on light transmittance:Light transmittance of the filmwithFilm thicknessThe increase is due to the fact thatFilm thicknessThe increase will increaseThe light is inside the filmThe chance of multiple reflections, thus increasingReflected lightstrength. ForHeterojunction cellsIn other words,ReflectivityThe lower, the betterLightEnterCrystalline silicon layer,Generate morePhotogenerated carriers,Raise the batteryShort-circuit current.
Effect of film thickness on reflectivity: withLight transmittanceThe effects are similar,Film thicknessThe increase will increaseThe light is inside the filmThe chance of multiple reflections increasesThe intensity of the reflected light. Heterojunction cellsAnd so it isThe lower the reflectivity,The more favorableLight enters the crystalline silicon layer,Generate morePhotogenerated carriers,ImproveThe short-circuit current of the battery.
Effect of film thickness on absorbance: forHeterojunction cellsto say,The magnitude of the absorbanceDependsThe material and band structure of the film. ForAmorphous silicon filmsbecause of itsThe width of the band is largeRightVisible lightofAbsorption ratelower, thereforeFilm thicknessto itEffect of absorption rateNot too. ForCrystalline silicon layer,because of itsThe width of the band is smallerRightThe absorption rate of visible lighthigher, thereforeFilm thicknessto itEffect of absorption rateLarger. And forHeterojunction cellsto say,The higher the absorption rate, the more photogenerated carriers are generated in the crystalline silicon layer, which increases the short-circuit current of the cell.
in the discussionFilm thicknessThe problem of causesPhysical parameters of film thicknesswill affectHeterojunction solar cellsperformance, for which producers often need to go through a reasonable, scientific production processThe performance of the batteryCreate higher efficiency. Meineng SolarAs an inspector, we provide experienced and highly satisfactory quality services to producersIn order to solve the problem of film thickness, Meineng Poly** film thickness tester has been produced to do its best for photovoltaic enterprise users and their battery manufacturers
Meineng Poly** Film Thickness Tester,
Business Contact: Manager Zhang
Meineng Poly5000** Film Thickness Tester is a poly film thickness tester specially designed for photovoltaic process monitoring, which can perform fast and automatic 5-point simultaneous scanning of samplesObtain information on the film thickness distribution at different locations of the sample, and customize the measurement size according to the customer's sample size.
Effective spectral range320nm~2400nm
Fast, automatic, 5-point simultaneous scanning
Repeatability0.5nm
Ultra-wide measuring range20nm-2000nm
**Monitoring and detection to achieve zero fragmentation rate
Realize the automatic detection of the whole production lineGreatly save detection time.
Film thicknessRightPhotoelectric conversion rate of heterojunction cells. has a significant impact, too thick or too thinFilmswill be loweredPhotoelectric conversion rate of the battery. By optimizationFilm thicknesscan be raisedPhotoelectric conversion rate of the battery. Achieve the best match. Meineng SolarproducedMeineng Poly** Film Thickness Tester,It can help battery manufacturers clearly characterizeFilm thicknessBattery manufacturers can rely on the accuracy of the obtainedFilm thickness parametersRightHeterojunction cellsEfficient adjustments and optimizations are made to produce highly efficientHeterojunction cells