Improved Hole Interfacial Layer for Planar Perovskite Solar Cells with Efficiency Exceeding 15%

Abstract

PSS based device.

Impact of fullerene derivative isomeric purity on the performance of inverted planar perovskite solar cells

“…In inverted PSCs, the HTL, typically PEDOT:PSS, modified PEDOT:PSS, or NiO x , 9–14 is in contact with the anode (ITO or FTO), while the ETL, typically a fullerene derivative, is in contact with the back electrode (Al or Ag). The standard fullerenes used in PSCs are [6,6]-phenyl-C 61/71 -butyric acid methyl esters (PC 61/71 BM), mainly due to their efficient electron transporting and solution processable properties.…”

Research Update: Strategies for improving the stability of perovskite solar cells

“…The reasoning was that GeO 2 due to its alkaline nature in aqueous solutions may be able to buffer the acidity of PEDOT:PSS to mitigate any ITO corrosion. In devices the hybrid p-type layer showed a much more stable performance than pristine PEDOT:PSS but still dropped to mere 50% of the initial performance within 26 h. 89 Thus far stabilizing devices with PEDOT:PSS as hole-extraction layer appears to be quite difficult with PEDOT:PSS attacking both of its interfaces. Choi and co-authors therefore abandoned PEDOT:PSS altogether and achieved a significant improvement in device stability in air by employing a pH-neutral polyelectrolyte.…”

Large-area electrospray-deposited nanocrystalline CuXO hole transport layer for perovskite solar cells

“…Consequently, metal-oxide-based HTL materials, such as NiO 14,15 and GeO, 16 have been proposed as alternatives to PEDOT:PSS. Devices with metal oxide HTLs have demonstrated photovoltaic performance similar to that of devices fabricated using PEDOT:PSS but with enhanced stability.…”