Operating Temperature Effect on the Thin Film Solar Cell Efficiency

Abstract

The made research results of the dependence of the film photovoltaic converter efficiency on their operating temperature and their comparison are considered in the paper. The physical mechanisms of temperature influence analysis on output, diode and electronic parameters of photovoltaic converters were conducted. The output parameters determination of the flexible photovoltaic converters was carried out by measurement of light current-voltage characteristics by using illuminator based on powerful semiconductor LEDs with different colors for simulated radiation which is close to the standard ground and ultraviolet solar spectrum. For ensuring effective non-destructive switching of the test specimens of the flexible PVC based on cadmium telluride to the measurement circle, the special contact device was developed and used. The main feature of contact device is four separate vertically moving metal probes in form of semi spheres with polished surfaces, which makes it impossible to puncture the PVC electrodes. These probes have possibility of individual positioning of each probe that is carried out with the help of a hard rotary console of variable length attached to the body and can be pressed with a given effort without impact on the frontal and any rear electrodes of the PVC experiments. The efficiency temperature coefficients of the photovoltaic converter, which make up for devices with a CdTe of 0.14 %/C, CuInSe2 -0.36 %/C, amorphous silicon -0.21 %/C were obtained. The analytical processing and analysis of the light diode characteristic effect on the PVC efficiency based on the CdTe showed that the temperature stability of their efficiency is ensured by the diode current density, the incision of which increases by 50 % from 1.9•10 -9 A to 2.7•10 -9 A with the temperature rise from 20 °С to 50 °С. At the same time, it has been established for PVC on the CuInSe and amorphous silicon base that the decrease of short circuit current density, open circuit voltage and fill factor of current-voltage characteristics plays the main role in efficiency reduction with rising temperature.

Simulation of Parameters of Coaxial Solar Cells Based on Si and InP Nanowires

“…have values of -6.6710 -3 , -0.5310 -3 , -3.3610 -3 and -7.8410 -3 K -1 . The obtained data on the values of the temperature coefficients are in good agreement with the experimental data for Si-based solar cells [15,16]. Note that the temperature dependences for the values of UOC, FF and  are typical for solar cells of various types.…”

“…Along with this, a promising direction of research is the study of temperature dependences of the parameters of solar cells [16][17][18]. Thus, in [15], the physics of the processes that determine the temperature sensitiv-ity of photovoltaic converters is discussed and the method of determining the temperature coefficients of the electrical parameters of nanowire solar cells (the open-circuit voltage UOC, short-circuit current density JSC, fill-factor FF, efficiency ) is presented.…”

Operational Calculation of Puncture Voltage of Drift n-p-n Transistors in Inverse Mode

“…when NЕB  NСB  NB according to expression (5), it should be obtained: NB.a. (I)  NB (6). The calculations shown confirm the adequacy of expression (5).…”

“…Considerable attention is paid to the problem of determining the exact characteristics of p-n junctions and semiconductor structures based on them. The studies mainly concern combinations of semiconductor materials used to create semiconductor structures and the influence of various external conditions on their characteristics, including breakdown parameters during inverse switching [2][3][4][5][6][7][8]. The real value of the breakdown voltage of bipolar transistors, both in direct and inverse switching, is determined by the smaller of the values of the avalanche breakdown voltage and the puncture voltage of the base when the space charge region (SCR) of the collector p-n junction, passing through the base, reaches the emitter region.…”

Uniaxial Heat Balance Model of the Solar Collector

“…An example of optimization of PV panels is the creation of PV/T panels [1,2]. This can be achieved by improving processes and models of heat balance [3,4], the results of optimization research and methods are given in this article.…”