Nanophotonics Class 9 Nanophotovoltaics. The world’s present sources of energy.

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Presentation transcript:

Nanophotonics Class 9 Nanophotovoltaics

The world’s present sources of energy

Different sources of energy: future oil coal gas nuclear power hydroelectricity biomass (traditional) biomass (advanced) solar power (photovoltaics (PV) & solar thermal generation (CSP) solar thermal (heat only) other renewables geothermal wind energy German Advisory Council on Global Change, 2003, year EJ/a PV & CSP gas coal oil sun

+ The greenhouse effect!

Available renewable energy sources

Black dots: area of solar panels needed to generate all of the worlds energy assuming 8% efficient photovoltaics Solar irradiance on earth Average solar irradiance, W/m 2.

Solar flux distribution on earth in kWh/m 2. day source: ABB, 1998

… © Ron Tandberg

Production costs of electricity US DOE (2002)

Explosive growth in PV manufacturing P. Maycock, PV News (2005)

Price per solar Watt vs. installed power P. Maycock

CHALLENGE How to reduce the price/Watt of photovoltaic energy ???? 1.Increase efficiency 2.Reduce materials costs

Solar cell basic geometry electron ( hole(+) front contact n-typesemiconductor p-typesemiconductor back contact anti reflection coating _ + generation electron (-) gat (+) front contact n-typesemiconductor p-typesemiconductor back contact anti reflection coating _ +

Current-Voltage characteristics

The first practical solar panel (1954) Bell Laboratories (1954)

Si solar cell efficiencies

Efficiency/cost of photovoltaic technology M. Green, UNSW Crystalline Silicon cells

Efficiency/cost of photovoltaic technology M. Green, UNSW Organic, thin- film cells

Improvements in solar cell efficiencies US DOE 2006

Third-generation photovoltaics M. Green, UNSW

H. Atwater (CALTECH) “Quantum defect” problem

H. Atwater (CALTECH)

Record efficiency solar cell NREL data (2005)

Efficiency/cost of photovoltaic technology M. Green, UNSW tandem cells

Efficiency/cost of photovoltaic technology M. Green, UNSW Thin- film cells

Thin-film solar cells

Poor IR absorption in (thin-film) Si solar cells solar spectrum EgEg Poor absorption just below bandgap

(a) (b) Absorption ~ r 3 Scattering ~ r 6 increased absorption in Si f subs f f air Goal: Ultra-thin-film solar cell Kylie Catchpole Albedo Ag Possible solution: light trapping

H. Atwater (CALTECH) “Quantum defect” problem

Semiconductor nanocrystals / quantum dots Increasing particle size single atoms Many open fundamental questions regarding multiple-exciton generation

Quantum dot tandem solar cell (science fiction!) 3.0 V2.0 V 1.0 V Plasmonic quantum dot solar cell

Upconversion from infrared to visible exc = 1490 nm 10 µm Ewold Verhagen, Kobus Kuipers transmission Nano Lett. 7, 334 (2007) 550 nm exc = 1480 nm Guiding and concentration observed to /16 Plasmonic hot-spot

Plasmonic nano-solar cell (science fiction!) E Small active semiconductor volume = low cost Small size  low minority carrier lifetime required p n

The Energy Problem: Needed: Large Area Cost-Effective Photovoltaics

k E x z New third-generation solar cell concepts f 3.0 V2.0 V 1.0 V YOU CAN HELP MAKE IT WORK !!