What determines the open-circuit voltage of a polymer based solar cell?

In particular, the dependence of VOC on four important factors, namely temperature, light intensity, work function of the electrode and material microstructure are discussed based on the model of density of states.

What is the use of open-circuit voltage in solar cell?

The open-circuit voltage, VOC, is the maximum voltage available from a solar cell, and this occurs at zero current. The open-circuit voltage corresponds to the amount of forward bias on the solar cell due to the bias of the solar cell junction with the light-generated current.

What is open-circuit voltage in Dssc?

An important reason for the relatively low efficiency of dye-sensitized solar cells (DSSCs) is the low open-circuit voltage (VOC) of about 0.7 V for a standard solar cell with a dye that has an absorption onset at 1.6 eV.

How does the open-circuit voltage of a solar cell panel change with temperature?

The effect of all the voltages is such that the total open-circuit voltage decreases with increasing cell temperature. The decrease in the open-circuit voltage with increasing temperature at low and medium levels of illumination is larger than that at high levels of illumination.

What is battery open circuit voltage?

Open Circuit Voltage (OCV) is the difference of electrical potential between positive and negative terminals of a battery without any load connected. The purpose of OCV test is to identify the battery electrical potential capability.

What is short circuit current in solar cell?

The short-circuit current is the current through the solar cell when the voltage across the solar cell is zero (i.e., when the solar cell is short circuited). Usually written as ISC, the short-circuit current is shown on the IV curve below.

What is the best voltage for solar panels?

If you must place solar modules over 30 meters from the house for adequate sun exposure, choose 24 volts or even better, 48 volts. Voltage converters (DC – DC Converters) are available to run 12 volt DC equipment from 24 volt or 48 volt batteries.

What is maximum PV open circuit voltage?

Open circuit voltage occurs whenever there isn’t any load connected to the PV modules, and current is not flowing. Maximum power voltage is the amount of voltage produced by the module that corresponds to the maximum amount of power for that module.

What is open circuit condition?

An open circuit is defined as an electric circuit in which current does not flow. Current can only flow in a circuit if it finds a continuous path—known as a “closed circuit”. If there’s a break anywhere in the circuit, you have an open circuit, and current can not flow.

Why voltage is maximum in open circuit?

The potential difference mentioned for batteries and cells is usually the open-circuit voltage. The open-circuit voltage is also known as the electromotive force (emf), which is the maximum potential difference when there is no current and the circuit is not closed.

How high can open-circuit voltage of polymer solar cells be tuned?

Here, we show that the open-circuit voltage of polymer solar cells constructed based on the structure of a low-bandgap polymer, PBDTTT 4, can be tuned, step by step, using different functional groups, to achieve values as high as 0.76 V.

Why maximize the open-circuit voltage in a low-bandgap polymer?

Maximizing the open-circuit voltage in a low-bandgap polymer is one of the critical factors towards enabling high-efficiency solar cells.

How to increase the efficiency of polymer solar cells?

… Following the development of the bulk heterojunction 1 structure, recent years have seen a dramatic improvement in the efficiency of polymer solar cells. Maximizing the open-circuit voltage in a low-bandgap polymer is one of the critical factors towards enabling high-efficiency solar cells.

How can we increase the efficiency of BHJ solar cells?

In principle, the strategies used to improve BHJ solar cell efficiency include (i) reducing the bandgap of polymers so as to harvest more sunlight, which leads to higher short-circuit current density ( Jsc) and (ii) lowering the highest occupied molecular orbital (HOMO) of the polymers, which increases the open-circuit voltage ( Voc ).