Periodic Reporting for period 1 - PERCISTAND (Development of all thin-film PERovskite on CIS TANDem photovoltaics)
Período documentado: 2020-01-01 hasta 2021-06-30
- Development of highly efficient semi-transparent perovskite solar cells with stabilized power conversion efficiency of 18.5% (10.5 mm2) and 17.2% (50 mm2). Low absorbing front and rear transparent conductive electrodes and anti-reflection coatings have been implemented to enhance transmissions >90%. A database with the optical properties was created, resulting in design rules to achieve >30% in perovskite/CI(G)S tandem solar cells.
- Combining silver alloying and rubidium doping of the narrow bandgap CISe absorber led to 18.2% efficiency, thanks to a significant increase in output voltage and improved micro-structure. The uniformity of the selenium distribution in the CISe layer over an areas of 325 mm x 325 mm was much improved. An improved chemical etching protocol for smoothing CIS absorber surfaces down to a root-mean-square surface roughness of 21 nm.
- Development of common device geometries for the solar cells and modules, for demonstrating fully functional tandem devices which performance can be externally certified. Demonstration of improved semi-transparent perovskite top cells, resulting in 27.3% 4-terminal tandem cell efficiency.
- Employing optimized anti-reflective coatings at the top contact, we achieved monolithic 2-terminal tandem devices with power conversion of 20.7% on a cell area of 0.5 cm². Screening of viable hole transport materials show that a combination of low-temperature ALD processes and organic interface modifications leads to the most promising device architectures.
- Development of an energy yield model and a LCA and TEA study on perovskite solar cells. The study presents a cradle to grave environmental techno-economic assessment (ETEA) of the perovskite solar cells. The energy yield model is being used to provide energy yield values for perovskite solar cells and various 2- and 4-terminal architectures.