Questions tagged [solar-cells]

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How does perovskite solar cell work?

Do you dope the perovskite material the same way you dope silicon? Is there a P-type perovskite and N-type perovskite inside the cell?
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Transfer matrix method

I am trying to figure out how to implement transfer matrix method to calculate how much of solar power gets absorbed in each layer. I am readying "Modeling photocurrent action spectra of photovoltaic ...
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18 views

Does incoming light polarization and phase effect the efficiency of photovoltaic cells?

As I understand it, standard photovoltaic cells depend on both the creation of electron-hole pairs and those pairs being created in the depletion zone in a P-N junction. Is seems like the production ...
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Why can't we choose a material with a low band gap to convert more photons into photo-electrons for a solar cell?

In Shockley–Queisser limit, how was the most efficient bandgap (1.5 eV) determined? Wouldn't you be able to generate more current with a lower bandgap since more photons are going to have enough ...
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I have a percent loss of the power output of a PV cell that isnt 1 meter squared. How can I aplpy the power loss to other panels

I made an experiment were I added sand ontop of a PV panel and measured the decrease in power output. I graphed the percent loss of the power output from when there was no sand. My panel isnt 1 meter ...
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3answers
88 views

$V$-$I$ characteristic of a solar cell

please explain the VI characteristics of a solar cell. The characteristics is given in my book without any explanation. How can the Voltage decrease on increasing current shouldn't it be opposite. ...
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1answer
32 views

How much solar power in kWH is there in the stratosphere during the day? [closed]

The stratosphere is above much of the atmosphere. People have talked about collecting solar energy there and beaming it back to Earth. How much power are we talking about?
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25 views

Why do we get lower voltage with smaller band gap and higher voltage with larger band gap in a solar cell?

It makes sense to me that if the band gap is smaller, we would get a higher current as more electrons will be promoted to the conduction band. However, I do not understand why voltage is lower. I ...
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24 views

Incident Photon to Converted Electron vs. UV-VIS absorbance

We can define the Incident Photon to Converted Electron (IPCE) for a solar cell as the ratio of photons that strike the solar cell to the number of electrons that flow out of the cell. Hence, we can ...
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1answer
30 views

Thermodynamic limits to photovoltaic or photochemical processes

Photovoltaic or photochemical (photosynthesis) processes are basically extracting energy from the temperature difference between the Sun and Earth. In practice they are only able to capture photons in ...
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2answers
62 views

Would this work as a way to get more energy from sunlight? [closed]

Plants only absorb certain wavelengths of light. This leaves a lot of light useless. But... imagine putting plants on a wheel and spin that wheel very fast. Then the light is red-shifted and so the ...
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1answer
33 views

Solar cell short circuit current

In order to obtain a solution to the short circuit current in a solar cell a boundary condition n=p=0 at the junction is imposed. Why only for short circuit current?
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43 views

Calculating output of a solar cell

If we are given a particular solar panel with some semiconductor tabs in it, How can I calculate the output of the Solar panel per metre square With the values of ( average hours of sun everyday, ...
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24 views

Solar cell: Surprising change in EL for varying PEDOT:PSS-thicknesses

I am currently working on improving a solar cell, which is partly transparent and therefore utilizes two transparent electrodes (TCO on top and PEDOT:PSS on the bottom). As PEDOT:PSS alone is not ...
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1answer
134 views

What kind of engine is a photovoltaic solar cell?

I have read several times here (on PSE) and there (in Google) that photovoltaic solar cells aren't heat engines. I.e. they are not working via a heat transfer between 2 reservoirs, and so they are not ...
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23 views

Open circuit voltage of solar panel in relation to temperature

How do we calculate the effect of temperature on the open circuit voltage of a solar panel? The source: https://www.pveducation.org/pvcdrom/solar-cell-operation/effect-of-temperature offers an answer,...
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1answer
53 views

How can one determine the key characteristics of a solar cell from the I-V curve?

I have recently measured the IV characteristics of several Si solar cell samples and am now attempting to extract the series resistance $R_S$; parallel resistance $R_P$; open circuit voltage $V_{OC}$; ...
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4answers
9k views

Why are solar panels kept tilted?

I have noticed that, in my country India, most of the solar panels are tilted southward at an angle of ${45}^{\circ} .$ Even on buildings with inverted V-shaped roofs, solar panels are still oriented ...
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1answer
30 views

Does quantum efficiency of solar cells vary with irradiance?

I want to know if a solar cell exposed to high irradiance (perhaps artificial light) of say 1500 w/m2 would suffer reduced QE. For the sake of the question lets assume the solar cell is in an ...
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1answer
65 views

what limitations stop a person from installing solar panels on his/her house? [closed]

Solar energy is a great form of energy. sourced from the sun, it can save a great deal of electricity bill cost. My question is why doesn't everyone uses it and install panels on their roof. Of ...
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77 views

Light Intensity vs Power for a Small Incandescent Lamp

Today I did a quick experiment where I measured the light intensity of a small incandescent bulb for a range of voltages (0 to 31V). I also measured the current. I expected to see the light ...
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1answer
48 views

Does doped semiconductor have free electrons at 0K?

For intrinsic semiconductors, they don't have any free electrons at conduction band at 0k and behave like insulators. But if doped, let's say n-type doped, they will have extra electrons which do not ...
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86 views

We just need a solar panelled SPAIN to power the world? [closed]

A stiffer, more formal (form, schmform!) way to ask this is: Is a solar panel field the size of Spain enough to cover the worlds energy needs? (This assumes that everything in the world runs on ...
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2answers
56 views

Will the electron-hole pairs in a solar cell ever run out?

I have read from various sources that, the photon strikes the solar cell and creates and electron hole pair which then migrates to their respective ends of the cells, this creates a potential ...
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1answer
59 views

Where do photons excite electrons in the PN junction?

Assuming a Si-Boron P-type, and Si-Phosphorous N-type solar cell. N-type is on top and P-type is bottom. I understand that after both semiconductors are layered a depletion zone is formed. Where e- ...
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37 views

Depletion layer of solar cell? [closed]

What happens to depletion layer of solar cells when light is falling on it? Please reply as soon as possible. Thank you
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71 views

Sonomotors, Sion: Can this electric car really charge up to 30km only from its solar cells? [closed]

Maybe you have heard about Sonomotors and its futuristic electric car, the Sion. If not, here is the link to its website: https://sonomotors.com/ Anyway, the manufacturer claims that this car can ...
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117 views

Attempting to calculate the mobility from SCLC measurement (space charge limited current)

I performed an SCLC measurement on a p-type material (hole transport layer) for a solar cell. Referring to the wikipedia page:https://en.wikipedia.org/wiki/Space_charge The relationship between $J$ ...
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46 views

Further doping p-type material. Why doesn't this increase the hole mobility. etc?

I did a project in which I made perovksite nanocrystal solar cells. The hole transport material was doped with another p-type material and performance was compared. It turns out that this didn't ...
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1answer
59 views

Solar panels efficiency [closed]

The efficiently of solar panels is quite low: about 30%. Could nanotechnology make improvements in solar panel technology?
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28 views

Why are the electrodes in thermodynamic equilibrium for a working solar cell?

I was reading a paper that performed simulation of a solar cell under illuminated conditions. Obviously, in these conditions, the device is out of thermodynamic equilibrium. For example the ...
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7answers
6k views

Why is silicon used for making solar cells?

Silicon has a bandgap of 1.1 eV, whereas germanium has 0.65 eV. Silicon has an indirect bandgap, whereas gallium arsenide has a direct bandgap. Still silicon is mainly used for making solar cells. Why?...
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1answer
61 views

Why are solar cells affected by temperature?

I know that solar cells efficiency increase with lower temperatures, but why? I found only equations on efficiency using temperature coefficient, but I want to know the physics behind it. Thank for ...
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1answer
69 views

Do solar panels generate more electricity at higher altitudes?

The atmosphere is thinner at higher altitudes, so do solar panels get more energy from the sun? Does the cold help or hinder their performance? Is a solar panel in space with no atmosphere is the ...
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21k views

Why don't solar panels contribute to global warming?

I've been wondering this for a while but I have not yet encountered an explanation. This is from my understanding of physics, which is by no means expert, so sorry for my crude explanation: Energy ...
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1answer
174 views

What does it mean if the resistance of a semiconductor increases due to light?

I have synthesized an $n$-type semiconductor material $\text{ZnO}$. Under light illumination, its resistance keeps increasing. What are the reasons for this?
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1answer
23 views

UV Preconditioning test [closed]

I wanna build a solar panel with a new material and I wanna to test the endurance of the material against UV light. I've found in internet a Standard for UV tests. It says it has to be irradiated with ...
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2answers
133 views

In photoelectric effect, what is effect of frequency? [closed]

So what does the frequency of the light in photoelectric effect does ? Does it increases number of electrons?
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1answer
70 views

An Experiment : A Infrared photovoltaic Cell In A Cooler Box

I like to propose an experiment here. A Japanese research institute has developed a photovoltaic cell that can generate electricity in a total dark environment. This photovoltaic cell can generate ...
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1answer
90 views

If energy is supposed to be a scalar, why does this logic of solar panels work?

In case of a solar panel, the light perpendicular to the surface gets absorbed while the parallel component doesn't. But wouldn't the scalar sum of magnitudes of parallel and perpendicular components ...
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3answers
72 views

Is it possible to power a car with chemiluminescence? [closed]

Chemiluminescence means substances that in a reaction emit light. I wonder if such a reaction would be possible to power an electric car using an photovoltaic panel lighted by the chemical reaction?
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Photovoltaic ‘Rectenna’ is it possible?

Video: https://youtu.be/BKyksxC_nxY A copper wire with N and P type Silicon on it wrapped around a fiber optic thread or glass rod with light entering on end and bouncing around inside and exiting ...