The ultimate efficiency of organic solar cells (OSC) is under active debate. The solar cell efficiency is calculated from the current-voltage characteristic as a product of the open-circuit voltage (VOC), short-circuit current (JSC), and the fill factor (FF). While the factors limiting VOC and JSC for OSC were extensively studied, the ultimate FF for OSC is scarcely explored. Using numerical dr...

The trade-off between the short-circuit current density (JSC) and open-circuit voltage (VOC) has been one of largest challenges in improving power conversion efficiencies (PCEs) organic solar cells...

This paper presents a low-cost high-efficiency solar energy harvesting system to power outdoor wireless sensor nodes. It is based on a Voltage Open Circuit (VOC) algorithm that estimates the open-circuit voltage by means of a multilayer perceptron neural network model trained using local experimental characterization data, which are acquired through a novel low cost characterization system inco...

Aligned ZnO nanowires with different lengths (1 to approximately 4 μm) have been deposited on indium titanium oxide-coated glass substrates by using the solution phase deposition method for application as a work electrode in dye-sensitized solar cells (DSSC). From the results, the increases in length of zinc oxide (ZnO) nanowires can increase adsorption of the N3 dye through ZnO nanowires to im...

A donor-acceptor (D-A) type indoline dye, D149, was used as an electron donor in solution-processed organic solar cells (OSCs). For bulk-heterojunction (BHJ) type OSCs with PC70BM as electron acceptor, the power conversion efficiency (PCE) is sensitive to the amount of D149 in the D149/PC70BM blend film. When the concentration of D149 in the blend film was as low as 5%, the highest PCE of up to...

We show that the effect of rapid thermal annealing (RTA) on carrier lifetime in GaInP grown by molecular beam epitaxy depends strongly both doping type and density, these disparities must be accounted for to realize high-performance solar cells. Although photoluminescence intensity lightly doped p- n-GaInP improved greatly with RTA, heavily n+-GaInP showed sharp degradation upon preventing real...

After several years of using solar cells, its electrical parameters are degraded. in this paper, to simulate aging, cells were exposed the different doses gamma radiation. The (I–V) characteristics silicon studied before and after irradiation. Experimental results showed that parameter panel such as short circuit current, open voltage, efficiency decrease with increase doses. As well as, depend...

In the conventional CdS/CdTe device structure, the poly-CdS window layer has a bandgap of ~2.4 eV, which causes absorption in the short-wavelength region. Higher short-circuit current densities (Jsc) can be achieved by reducing the CdS thickness, but this can adversely impact device open-circuit voltage (Voc) and fill factor (FF). Also, poly-CdS film has about 10% lattice mismatch related to th...

In this work, we report a degradation study of high-efficiency conventional polymer solar cells (PSCs). The high performance the PM6:Y7-based device is achieved with power conversion efficiency (PCE) up to 15.64% in first measurement. article describes results measurements and analysis process. electrical parameters during process were extracted from current density – voltage characteristics cu...

Spray-deposited thin films of zinc oxide (ZnO) and aluminum-doped (Al-ZnO) are characterized in detail to get insight into the role a dopant matrix. ZnO Al-ZnO implemented as electron transport layers (ETLs) inverted organic solar cells (IOSCs) with PTB7-Th donor IEICO-4F nonfullerene acceptor, forming bulk heterojunction (BHJ) photoactive layer. Organic (OSCs) based on ETL exhibit short-circui...