Penn material scientists demonstrate the transduction of optical radiation to electrical current in a molecular circuit
in [Physics]
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From: Mike Jr on 12 Feb 2010 22:00 ""If the efficiency of the system could be scaled up without any additional, unforeseen limitations, we could conceivably manufacture a one-amp, one-volt sample the diameter of a human hair and an inch long," Bonnell said." http://www.eurekalert.org/pub_releases/2010-02/uop-pms021210.php --Mike Jr.
From: Uncle Al on 13 Feb 2010 13:03
Mike Jr wrote: > > ""If the efficiency of the system could be scaled up without any > additional, unforeseen limitations, we could conceivably manufacture a > one-amp, one-volt sample the diameter of a human hair and an inch > long," Bonnell said." > > http://www.eurekalert.org/pub_releases/2010-02/uop-pms021210.php Let's run the numbers at 100% efficiency: 1 W from an area 50 microns wide and 2.54 cm long. The intercept projection for absorbing optical radiation is a rectangle (zero reflection), width times length, (50 microns)(1 cm/10^4 microns)(2.54 cm) = 0.0127 cm^2, 78.7 W/cm^2 Solar constant 1366 W/m^2 = 0.1366 W/cm^2 (78.7)/(0.1366) = 576 suns **in space** More at ground level. It stinks. Wire cross-section is (pi)r^2. What is the current density for 1 amp? (1 amp)/(pi)[(0.005 cm/)2]^2 = 51,000 amp/cm^2 It stinks. -- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz4.htm |