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Antimony trisulfide PV cell hits 4.9% efficiency with fluorene-based HTMs – pv magazine International


A world analysis group used the ultrasonic spray pyrolysis (USP) technique to provide an antimony trisulfide PV cell with excessive energy conversion effectivity and distinctive common seen transmittance. The cell has an lively space of ​​7.06 mm2.

Scientists at Estonia’s Tallinn College of Know-how (TalTech) have designed a photo voltaic cell based mostly on antimony trisulfide (Sb).2S3) utilizing fluorene-based gap transport supplies (HTMs) with terminating thiophene models.

“HTMs have been systemized and developed by the analysis group of Prof. Vytautas Getautis at Kaunas College of Know-how,” mentioned researcher Ilona Oja Acik. pv journal.

“Sb2S3 is a promising candidate for the photovoltaic neighborhood on account of its ample earth and environmentally pleasant constituent parts together with appropriate optoelectronic properties similar to a fascinating band hole round 1.7 eV, giant absorption coefficient (about 10).5 cm-1) and long-term stability, “scientists defined, noting that the utmost effectivity for such PV units presently stands at 8%. “The general effectivity is restricted by open circuit deficiencies voltage (vO.C) attributed to the self-trapping of carriers on account of lattice deformation and/or to intrinsic defects, setting the utmost achievable vO.C to 0.8 V.

The analysis group used the ultrasonic spray pyrolysis (USP) technique to construct a cell with an lively space of ​​7.06 mm.2. The gadget is predicated on a substrate fabricated from glass and fluorine-doped tin oxide (FTO), titanium oxide (TiO2) electron transport layer (ETL), a Sb2S3 absorber, the fluorene-based gap transport supplies (HTMs) with terminating thiophene models, and gold (Au) steel contacts.

“Sb2S3 The photo voltaic cells with the brand new HTM are fabricated in an ordinary superstrate configuration the place the ETL and absorber are deposited on the USP whereas the HTMs are coated adopted by thermal evaporation of Au,” they defined. “The as-deposited Sb2S3 The movies have been annealed at about 250-260 C for five min beneath nitrogen.

The champion gadget constructed has an influence conversion effectivity of 4.94%, an open-circuit voltage of 0.68 V, a short-circuit present of 13.7 mA/cm2, and a fill issue of 0.53. This cell makes use of fluorene-based molecules often known as V1385. The researchers say that it will make sure the believable creation of Sb2S3 photo voltaic cells with efficiencies shut to five% at very low value.

As compared, Sb2S3 photo voltaic cells constructed utilizing typical gap transporting layers (HTL) fabricated from the polymer Regioregular poly(3-hexylthiophene) (P3HT) has reached efficiencies of as much as 4.7% thus far on the analysis stage.

“Nevertheless, they present low transparency (26%) on account of parasitic absorption losses of P3HT,” the lecturers mentioned. “Novel cost-effective and clear fluorene-based thiophene-terminated gap transport supplies are demonstrated, for the primary time, in semitransparent Sb2S3 photo voltaic cell that reveals an influence conversion effectivity of 4.5% ot 4.9% and a mean seen transmittance of 30% to 33% (with out steel) within the 400 nm to 800 nm vary.

They offered the photo voltaic cell in “4.9% Effectivity Sb2S3 Photo voltaic Cells from Semitransparent Absorbers with Fluorene-Primarily based Thiophene-Terminated Gap Conductors,” just lately printed in ACS Publications.

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