High-Performance 1 cm² Perovskite-Organic Tandem Solar Cells with a Solvent-Resistant and Thickness-Insensitive Interconnecting Layer

Abstract

Organic solar cells (OSCs) and perovskite solar cells (PVSCs) are promising candidates for next-generation thin film photovoltaic technologies. The integration of OSCs with PVSCs in tandem devices is now attracting significant attention due to their similar fabrication procedures and the potential to afford a higher device performance. Here, a thickness-insensitive and solvent-resistant interconnecting layer is developed to efficiently connect perovskite and organic subcells with low contact resistance. The resultant perovskite-organic tandem devices maintain high efficiencies over a wide thickness range of the interconnecting layer, from ∼20 nm to ∼50 nm, providing an easily fabricated, solvent-resistant platform to integrate perovskite and organic active layers with low-temperature solution processing techniques. The tandem devices containing an ultrathin PVSC and a typical non-fullerene OSC give a maximum efficiency of 19.2%, which is much higher than those of the single-junction devices. Moreover, highly reproducible 1 cm2 perovskite-organic tandem devices are achieved using the thickness-insensitive and solvent-resistant interconnecting layer, and an efficiency of 17.8% is realized. These 1 cm2 tandem solar cells are used successfully in solar-to-hydrogen systems to afford a solar-to-fuel conversion efficiency of 11.2%. Overall, these advances represent significant progress in the design of ultrathin and facile solution processed perovskite-organic tandem solar cells.

Interface Engineering for Highly Efficient Organic Solar Cells

“…Recently, Zhang et al incorporated C 60 ‐ionene to construct ICL with C 60 ‐ionene/Ag/MoO 3 structure. [ 354 ] Benefiting from the high conductivity, C60‐ionene‐based ICLs show a broad thickness processing window. The PCEs of corresponding devices maintained over a wide range of ICL thicknesses, from 20 to 50 nm, with the highest value being 19.2%.…”

Influence of Component Properties on the Photovoltaic Performance of Monolithic Perovskite/Organic Tandem Solar Cells: Sub‐Cell, Interconnecting Layer, and Photovoltaic Parameters

“…The V OC values for PM6:Y6-based n-i-p SOSCs (0.78-0.83 V, Table 1) and p-i-n SOSCs (0.815-0.87 V, Table 2) undergo severe losses to the bandgap. [55][56][57] Consequently, novel organic materials with decreased V OC loss must be developed for enhancing the SOSCs performance and thereby, the POTSCs efficiency.…”

Modulation of Photoinduced Phase Segregation and Stress-Driven Nanoscale Cracking in Hybrid Halide Perovskite Solar Cells

“…Halide perovskite has become a very promising semiconductor material for the new generation of solar cells, light-emitting devices, and photodetectors. − Its advantages are high-absorption coefficient, long carrier diffusion length, and convenient band gap adjustment in the visible light range, achieved by adjusting the proportion of halide precursors. − Accurate control of the band gap provides an opportunity to integrate hybrid perovskite into light-emitting devices, lasers, and tandem solar cells. , In particular, the uninterrupted band gap from ∼1.77 to 2.38 eV makes the all-inorganic cesium lead halide an ideal choice for single junctions or tandem solar cells. − In 2015, Hoke et al found that strong and reversible sub-band-gap photoluminescence characteristics were induced at ∼1.68 eV upon illumination with white light and reported the reversible photoinduced halide segregation (PIHS) phenomenon in hybrid halide perovskite films . However, PIHS causes homogenized halide ion segregation to form domains, and charge carriers are trapped in iodide rich regions, thus resulting in local changes in the material’s band gap. − Thus, the practical applications of hybrid halide perovskite are limited. − Therefore, it is crucial to determine the microscopic mechanism behind the PIHS to allow the development of methods to reduce the photoinduced effects in devices.…”