A generic interface to reduce the efficiency-stability-cost gap of perovskite solar cells

Abstract

A major bottleneck delaying the further commercialization of thin-film solar cells based on hybrid organohalide lead perovskites is interface loss in state-of-the-art devices. We present a generic interface architecture that combines solution-processed, reliable, and cost-efficient hole-transporting materials without compromising efficiency, stability, or scalability of perovskite solar cells. Tantalum-doped tungsten oxide (Ta-WO )/conjugated polymer multilayers offer a surprisingly small interface barrier and form quasi-ohmic contacts universally with various scalable conjugated polymers. In a simple device with regular planar architecture and a self-assembled monolayer, Ta-WO -doped interface-based perovskite solar cells achieve maximum efficiencies of 21.2% and offer more than 1000 hours of light stability. By eliminating additional ionic dopants, these findings open up the entire class of organics as scalable hole-transporting materials for perovskite solar cells.

Gas-solid reaction based over one-micrometer thick stable perovskite films for efficient solar cells and modules

“…While the PCEs of the MAPbI 3 (AS) devices decreased to 90% of their initial performance after approximately 300 h. An initial increase of PCEs for both samples is observed in the first 20 h of the stability test. A similar phenomenon was also observed previously 55,62 , and was ascribed to the effects such as elevated temperature (approximately 46 °C), light or field induced ion movement, light-induced traps formation, interfacial charge accumulation 55 , or spiro-OMeTAD conductivity variation 63 . In addition, both devices showed a fast, exponential decay region after reaching the highest performance points, which is followed by a slower linear decay 64 .…”

Recent Advance in Solution‐Processed Organic Interlayers for High‐Performance Planar Perovskite Solar Cells

“…Reproduced with permission 89. Copyright 2017, The American Association for the Advancement of Science.…”

Efficient Passivation with Lead Pyridine‐2‐Carboxylic for High‐Performance and Stable Perovskite Solar Cells

“…[1][2][3][4][5][6] The certified efficiency of perovskite solar cells (PSCs) has exceeded 24% within the past few years, which is comparable against the silicon-based solar cells. [3,9,10] Efforts have been carried out to improve the stability of PSCs such as solvent engineering, [11][12][13] interface engineering, [14,15] composition engineering, and encapsulation. [3,4,7,8] In comparison with silicon, organic-inorganic halide perovskite is endowed with soft crystal lattice (low formation energy) and prone to decompose when exposed to oxygen, ultraviolet (UV) illumination, hyperthermia, or electric tension.…”