Posted by Anonymous on Saturday, October 26, 2013 at 2:50pm.
Figure 1 shows a simplication of the AM1.5 solar spectrum at 1000W/m2. The spectrum is divided in three spectral ranges:
A for 0nm<λ<620nm
B for 620nm<λ<1240nm
C for 1240nm<λ<1860nm
The photon flux in each spectral range is also shown in the figure.
a) The hydrogenated silicon carbide material (aSiC:H) is a new type of amorphous semiconductor material which has been recently studied for PV applications. This material has a relative large band gap of 2.0 eV. Imagine we integrate this material in a singlejunction pin solar cell as shown in Figure 2a below. In which spectral ranges does this solar cell convert light into charge carriers?
1)A
2)B
3)C
b) What is the Jsc (in mA/cm2) of the solar cell if only 65% of the absorbed photons result in a current?
c) The Voc in V of the aSiC:H solar cell can be roughly estimated by the equation:
Voc=Egap(J)2q=Egap(eV)2
where q is the elementary charge, Egap(J) is the bandgap energy expressed in Joules, and Egap(eV) is the bandgap energy expressed in eV. The fill factor of the solar cell is FF=0.80. What is the efficiency of the solar cell (in %) ?
An upconvertor is a material which can convert two lowenergy photons into a higher energy photon. Placing an upconvertor in our solar cell can help to reduce the spectral mismatch, since it can convert some photons with energy lower than 2 eV, which are not absorbed by the aSiC:H cell, into a photon with an energy higher than 2 eV. Figure 2b depicts this possibility.
d) In the upconvertor 1, two photons are converted into one photon with 100% conversion efficiency. If all photons with energy above that of the band gap of aSiC:H are absorbed in the aSiC:H layer, in which spectral range can the photons be upconverted so that they contribute to the current in the cell as well?
1)A
2)B
3)C
e) In that case what would be the shortcircuit current density and the efficiency of the solar cell illustrated in Figure 2b? Assume again that 65% of the absorbed photons result in a current.
Shortcircuit current density in mA/cm2
Efficiency in %
f) In upconvertor 2 (see Figure 2c), three photons are converted into one photon with 100% conversion efficiency. if all photons with energy above that of the band gap of aSiC:H are absorbed in the pin cell, and convertor 1 absorbs only the photons in the spectral range as considered in parts e) and f), in which spectral part can the photons be upconverted by convertor 2 so that they contribute to the current in the cell as well?
1)A
2)B
3)C
g) In that case what would be the shortcircuit current density and the efficiency of the solar cell illustrated in Figure 2c? Assume that 65% of the absorbed photons result in a current.
Shortcircuit current density in mA/cm2
Efficiency in %

Solar Energy Please Help  I.G., Sunday, October 27, 2013 at 4:44am
a) A
d) B
f) C

Solar Energy Please Help  Anonymous, Sunday, October 27, 2013 at 4:25pm
Can you also give out the rest of the answers?? thanks

Solar Energy Please Help  jen, Monday, November 4, 2013 at 7:46am
where is the rest of the answers?

Solar Energy Please Help  Anonymous, Monday, November 4, 2013 at 1:31pm
jen the answers are in your nose.
Next time ask nicely.

Solar Energy Please Help  Ken, Monday, November 4, 2013 at 4:18pm
It is not possible to solve the rest of the answers the figure are missing.

Solar Energy Please Help  Anonymous, Thursday, November 7, 2013 at 1:06am
Please Is anybody who can help this question? Thanks

Solar Energy Please Help  Ken, Thursday, November 7, 2013 at 6:57pm
Why don't you add the missing figures
2a, 2b, and 2c

Solar Energy Please Help  A, Saturday, November 9, 2013 at 3:45pm
courses edx org/c4x/DelftX/ET3034TUx/asset/Week5_Specturm png
This is the image's url, replace the spaces with dots

Solar Energy Please Help  Ken, Sunday, November 10, 2013 at 3:50am
Link doesn't works

Solar Energy Please Help  A, Sunday, November 10, 2013 at 4:03am
postimg org/image/kylqxalt7/
Try this put a dot after 'postimg'

Solar Energy Please Help  Anonymous, Sunday, November 10, 2013 at 2:06pm
The link is for fig. 1
still need fig 2a, 2b, and 2c

Solar Energy Please Help  Anonymous, Tuesday, November 12, 2013 at 4:43am
ϕ=9.3∗1020m−2s−1 for 300nm<λ<650nm
ϕ=8.4∗1020m−2s−1 for 650nm<λ<850nm
ϕ=1.4∗1021m−2s−1 for 850nm<λ<1250nm

Solar Energy Please Help  Anonymous, Tuesday, November 12, 2013 at 4:44am
AND
Voc = Egap(J)/2q = Egap(eV)/2

Solar Energy Please Help  Anonymous, Tuesday, November 12, 2013 at 4:45am
Sorry the above 2 answers are for another question...

Solar Energy Please Help  Anonymous, Tuesday, November 12, 2013 at 4:46am
use this link
postimg org/image/htap77x5d/

Solar Energy Please Help  Ken, Tuesday, November 12, 2013 at 1:57pm
1a. = A
1.b = 10.4mA/cm2, 8.33%
1c = B
1d = 18mA/cm2, 14%
1f = C
1g = 18.7 mA/cm2, 15%

Solar Energy Please Help  Anonymous, Tuesday, November 12, 2013 at 3:35pm
Thanks

Solar Energy Please Help  Anonymous, Tuesday, November 12, 2013 at 3:36pm
Can you please answer this too
jiskha com/display.cgi?id=1382813246

Solar Energy Please Help  UNO, Sunday, November 24, 2013 at 4:18pm
Thanks Ken

Solar Energy Please Help  Lauren, Thursday, December 5, 2013 at 12:40am
what are the answer to the e) please

Solar Energy Please Help  Naif, Saturday, November 22, 2014 at 7:24am
e 14 and thanks for the answers guys i will pray for u :)

Solar Energy Please Help  student, Saturday, October 10, 2015 at 6:54pm
e is 14 and 14 again

Solar Energy Please Help  MANIRAGUHA Eric, Tuesday, September 6, 2016 at 7:12am
1)A
2)10 mA/cm^2
3)8%
4)B
5)18mA/cm^2
6)14%
7)C
8)19mA/cm^2
9)15%
Enjoy guys!!!!

Solar Energy Please Help  SB, Sunday, January 1, 2017 at 1:21pm
When adding the photon flux of A and half of the photon flux of B I come to 1.55E+17 photons/cm2. This gives a shortcircuit current density of 16.12mA/cm2 which is wrong. Where is my mistake???
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