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Rahman, A.
- Electrical Properties of Thin Film Al-(N)Cdse/(P)Si-Al Heterojuction and its Performance as a Photovoltaic Converter
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Photovoltaic Effect
Authors
Mothura Nath Borah
,
Sumbit Chaliha
,
Bhaskar J. Baruah
,
Suvangshu Dutta
,
G. Bortamuly
,
A. Rahman
,
Bedanta Bora
Source
International Journal of Innovative Research and Development, Vol 1, No 7Sp (2012), Pagination: 135-145Abstract
To fabricate the (n)CdSe/(p)Si heterojunctions, Ag-doped CdSe thin films of doping concentration up to 7.23×1016cm-3 have been deposited onto p-type silicon wafer by sequential thermal evaporation technique. Different junction parameters such as diode ideality factor (n), built in potential (Vbi), reverse saturation current density (J0), Richardson's constant (A*), short-circuit current (Voc), etc. were determined from current-voltage (I-V) characteristics. The ideality factor was found greater than unity with high series resistance (Rs). These parameters show significant changes with variations of doping concentration and temperature. The I-V characteristics under illumination showed poor photovoltaic (PV) effect. However the structures showed the change of PV effect, giving a fill factor (FF) 0.43 for annealed sample with an open-circuit voltage (Voc) 100 mV, a short-circuit current density (Jsc 13.2 μAcm-2 on increasing the doping concentration up to Nd = 7.23×1016cm-3. Large series resistance, high defect density and presence of interfacial layer are thought to be responsible for higher values of ideality factor and poor PV conversion efficiency. Proper doping and annealing are necessary to reduce the series resistance so as to achieve an ideal and high efficiency PV device.Keywords
Cadmium Selenide (cdSe), Thermal Evaporation Technique, Diode Ideality Factor,Photovoltaic Effect
- Diversity of Insects in Pulses at Arunachal Pradesh
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Authors
Affiliations
1 ICAR-Krishi Vigyan Kendra Namsai 792104, Arunachal Pradesh, IN
1 ICAR-Krishi Vigyan Kendra Namsai 792104, Arunachal Pradesh, IN
Source
Indian Journal of Entomology, Vol 84, No 2 (2022), Pagination: 409-411Abstract
Surveys were conducted during 2018-19 and 2019-20 for evaluating the abundance and diversity of insect pests and foragers in Namsai District of Arunachal Pradesh from pulse crops (black gram, green gram and pigeonpea). The data on species richness, dominance and distribution of insects revealed a total of 38 insect pests belonging to 6 orders, 26 families and 38 species. Of these 12 species were observed as foragers. Coleoptera was the most dominant group followed by Lepidoptera, Hemiptera, Hymenoptera, Mantodea and Araneae (Arachnida). Among the observed foragers Polistes sp. was found to be dominant followed by Apis dorsata (F).Keywords
Insects, Pulses, Greengram, Blackgram, Pigeon Pea, Diversity, Pests, Foragers, Pollinators, Abundance, Coleoptera, Hemiptera, Hymenoptera, Lepidoptera, Mantodea, Araneae.References
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