Structures containing layers of porous silicon with two metal contacts are investigated. Porous silicon is manufactured by anodizing p-type crystalline silicon plates of resistivity of 0.4 Ω cm. Contacts for the samples are made by additional boron doping of the surface and by thermal evaporation of aluminium. Resistance and current-voltage characteristics are investigated. Response of the porous silicon layer containing structures under action of pulsed microwave radiation was investigated for the first time. The origin of the response is discussed.
Silicon solar cells produced by a usual technology in p-type, crystalline silicon wafer were investigated. The manufactured solar cells were of total thickness 450mm, the junction depth was of 0.5 mm–0.7 mm. Porous silicon technologies were adapted to enhance cell efficiency. The production of porous silicon layer was carried out in HF: ethanol = 1:2 volume ratio electrolytes, illuminating by 50 W halogen lamps at the time of processing. The etching current was computer-controlled in the limits of (6÷14) mA/cm2, etching time was set in the interval of (10÷20) s. The characteristics and performance of the solar cells samples was carried out illuminating by Xenon 5000 K lamp light. Current-voltage characteristic studies have shown that porous silicon structures produced affect the extent of dark and lighting parameters of the samples. Exactly it affects current-voltage characteristic and serial resistance of the cells. It has shown, the formation of porous silicon structure causes an increase in the electric power created of solar cell. Conversion efficiency increases also respectively to the initial efficiency of cell. Increase of solar cell maximum power in 15 or even more percent is found. The highest increase in power have been observed in the spectral range of Dl @ (450÷850) nm, where ~60 % of the A1.5 spectra solar energy is located. It has been demonstrated that porous silicon technology is effective tool to improve the silicon solar cells performance.
The paper examines the parameters of crystalline silicon solar cells such as fill factor, maximal output power and series resistance forming a porous silicon layer. The obtained results show that introducing the layer into the structure of a solar cell results in a 19 percent enhancement of maximal output power and conversion efficiency.
Santrauka
Šiame darbe tiriamas akytojo silicio darinių poveikis saulės elementų elektrinėms charakteristikoms: nuosekliajai varžai, voltamperinių charakteristikų formai. Parodyta, kad pagaminus silicio saulės elemente akytojo silicio sluoksnį, galima veikti (valdyti) saulės elementų voltamperines charakteristikas ir elemento nuosekliąją elektrinę varžą. Nustatyta, kad tiriamajame bandinyje suformavus akytojo silicio sluoksnį, apkrovos voltamperinės charakteristikos užpildos rodiklis padidėjo 1,15 karto, o maksimali elemento kuriama ir apkrovos metu atiduodama elektros energijos galia – 1,19 karto. Tiek pat 1,19 karto padidėjo saulės elemento šviesos konversijos į elektros energiją efektyvumas.
Photoresponse of silicon samples containing porous structures have been studied under the action of CO2 laser radiation. The signal shape and its behavior under the applied bias voltage revealed the existence of two heterojunctions on the border of porous-crystalline silicon and on the border between the porous layers of different porosity. The photosignal is recognized to be composed of hot hole photoemfs induced across the heterojunctions.
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