Presentation1.pdf
- 1. 1 Contents Objectives Materials selection Design, simulation and parameter optimization Parametric analysis Background and motivation Conclusions
- 2. 2 Background and Motivation Energy Demand and Production World Energy Consumption by Fuel type Gap between demand & production Dependency on non-renewable sources Natural Gas, 19% Renewables, 18% Solar, <1% Nuclear, 16% Coal, 41% Oil, 6%
- 3. 3 Background and Motivation.. Environmental attributes of different sources Energy reservations of fossil fuels Fossil fuels scarcity Less CO2 emission
- 4. 4 Renewable Energy Electricity Heat Sunlight Solar Cell Future Energy Demand and Technology
- 5. 5 Objectives Investigate Gnp as window layer in CZTS solar cell Improve efficiency Improve thermal stability 1. 2. 3.
- 6. 6 Potential Candidates • Unstable in saline plasma • Can’t used as front contact in superstate configuration. SnO2 • Cause current leakage FTO • Rare material • Brittle • High fabrication cost ITO • Highly transparent • Flexible • Thermally stable • Tunable band-gap Gnp
- 7. 7 Materials Selection Proposed cell Window layer (Graphene) • Super durable and conductivity, flexible • High transparency, low cost, non-fragile Buffer layer (ZnO) • Wide direct bandgap (3.3 eV) • Eco friendly and highly abundant Absorber layer (CZTS) • Direct bandgap (1.4~1.5 eV) • Abundant, cheaper, non-toxic Back contact (Ni) • Work function 5.15 eV • Abundant, cheaper, non-toxic
- 8. 8 Design, Simulation and Parameter Optimization SCAPS generated cell Parameters used for different layers
- 9. 9 Parametric Analysis: CZTS Thickness Variation Gnp improves cell performance at same thickness Without graphene With graphene Voc (V) Jsc (mA/ cm2) FF (%) 𝜂 (%) Without Gnp 0.849 23.38 82.53 16.4 With Gnp 0.85 23.81 84.64 17.14
- 10. 10 Effect of Doping Concentration and Temperature Effect of CZTS doping concentration Effect of temperature Less output variation showing thermal stability All parameters increase except Jsc
- 11. 11 Quantum Efficiency and J-V Characteristics QE characteristics J-V characteristics QE improves 25% to 90% Improved J-V characteristics
- 12. 12 Conclusions Investigated Graphene as alternative to ITO. Increases sustainability of PV solar cell. Obtained higher FF, Jsc and 𝜂 using less number of layers. High Thermal stability. Reduced absorber layer thickness.
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