Triple-junction a-Si based solar cells, having a structure ofSS/Ag/ZnO/n/n/b/a-SiGe-i/b/p/p/n/n/b/a-SiGe-i/b/p/p/n/n/a-Si-i/p/p/ITO, are fabricated at the University of Toledousing a multi-chamber, load-locked PECVD system. We studied the effect of heavily doped pand n layers deposited at the tunnel junction interfaces between the top and middle componentcells and between th...

High bandgap perovskite solar cells are integral to perovskite-based multi-junction tandem with efficiency potentials over 40%. However, at present, high devices underperform compared their mid counterparts in terms of voltage outputs and fill factors resulting lower than ideal efficiencies. Here, the low factor aspect is addressed by developing a cation-diffusion-based double-sided interface p...

In this article, we developed a microcrystalline silicon tunnel junction to be used as recombination between large-gap top cell and heterojunction bottom cell, in monolithic tandem integration. This is composed of p-type layer on the an n-type layer, deposited by plasma-enhanced chemical vapor deposition at low temperature (200 °C). Microcrystalline phase percentage was controlled with Raman sp...

Investigation and development of a separating mesa-structure creating technology for fabricating multi-junction solar cells based on the GaInP/GaInAs/Ge heterostructure has been carried out. Studied were methods etching layers: liquid chemical in etchants HBr, H2O2, K2Cr2O7 plasma-chemical stream operating gas BCl3. The comparative analysis was studied. protective masks photoresist layer TiOx/S...

Tandem solar cells provide an effective way to harvest a broader spectrum of solar radiation by combining two or more solar cells with different absorption bands. However, for polymer solar cells, the performance of tandem devices lags behind single-layer solar cells mainly due to the lack of a suitable low-bandgap polymer. Here, we demonstrate highly efficient single and tandem polymer solar c...

The most important features of microcrystalline silicon (Fc-Si:H) and microcrystalline silicon based p-i-n solar cells (specially those deposited by VHF-Glow Discharge) are reviewed. Since such material has been recognized to be a photovoltaically active material, stabilized cell efficiencies have steadily risen and have now reached 12% in the so called “micromorph” (microcrystalline/amorphous)...