Activities per year
Abstract
Optical solutions are promising for Perovskite solar cell (PSC) technology, not only to increase efficiency, but also to allow thinner absorber layers (higher flexibility) and improve stability. This work optimized the combined anti-reflection and scattering properties of two types of light trapping (LT) structures, based on TiO 2 semi-spheroidal geometries with honeycomb periodicity, for application in PSCs with substrate configuration and different perovskite layer thicknesses. Their optically lossless material (TiO 2 ) allows the structures to be patterned in the final processing steps, integrated in the cells’ top n contact, therefore not increasing the surface area of the PV layers and not degrading the electric performance via recombination. Therefore, this strategy circumvents the typical compromise of state-of-the-art LT approaches between optical improvements and electrical deterioration, which is particularly relevant for PSCs since their main recombination is caused by surface defects. When patterned on the cells’ front, the wave-optical micro-features composing the LT structures yield up to 21% and 27% photocurrent enhancement in PSCs with conventional (500 nm thick) and ultra-thin (250 nm) perovskite layers, respectively; which are improvements close to those predicted by theoretical Lambertian limits. In addition, such features are shown to provide an important encapsulation role, preventing the cells’ degradation from UV penetration.
Original language | English |
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Pages (from-to) | 91-101 |
Number of pages | 11 |
Journal | Nano Energy |
Volume | 59 |
DOIs | |
Publication status | Published - 1 May 2019 |
Keywords
- Light trapping
- Perovskite solar cells
- Photonics
- Photovoltaics
- UV stability improvement
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Design of optimized photonic microstructures coupled with luminescent down-shifting for high-efficient, flexible and stable perovskite solar cells.
Manuel João Dias Mendes (Speaker)
Dec 2019Activity: Talk or presentation › Oral presentation
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Materials for Renewable Energy - International School of Solid State Physics of the Materials Research Society (MRS)
Manuel João Dias Mendes (Participant)
Jul 2018Activity: Participating in or organising an event › Participation in conference