PTAA as Efficient Hole Transport Materials in Perovskite Solar Cells: A Review

Abstract

Perovskite solar cells (PSCs) with a power conversion efficiency (PCE) overpassing 25% have proved to be the most promising competitor for the next‐generation photovoltaic technology. Massive efforts are devoted to the improvement of the performance and stability of PSCs, whereas the hole transport layer (HTL) has attracted significant interest. Among diverse hole transport materials, poly[bis(4‐phenyl)(2,4,6‐trimethylphenyl)amine (PTAA) is one of the most promising candidates due to its ease of fabrication, transparency to visible light, mechanical flexibility, conductivity, and stability. Over the past few years, there has been an increasing amount of research using PTAA as the HTL first in n–i–p and then in p–i–n PSCs with extended applications in flexible, large‐area, and tandem devices. Herein, a progress review on PTAA for PSC applications is provided, which enables a better understanding of the advantages and disadvantages of PTAA, as well as the approaches to fully realizing its tremendous potential. The emerging and promising research directions for PTAA‐based PSCs are discussed, shedding light on the practical applications of PTAA.

Semi‐Transparent Blade‐Coated FAPbBr3 Perovskite Solar Cells: A Scalable Low‐Temperature Manufacturing Process under Ambient Condition

“…[ 25 ] SnO 2 has been deemed as an ideal ETL due to high carrier mobility, low parasitic absorbance in the visible spectrum, high chemical stability, and insensitivity to ultraviolet (UV) light. [ 26 ] The PTAA polymer has been tested in both NIP and PIN device architecture showing great potential in terms of PV performance, [ 27 ] long‐term stability, [ 28 ] and tolerance to sputtering damage. [ 29 ] We consider several fabrication processes from fully spin‐coated (SC) to fully blade‐coated (BC) devices.…”

Review of Inorganic Hole Transport Materials for Perovskite Solar Cells

“…[102] Apart from spiro-OMeTAD, poly(triarylamine) (PTAA) is also used in the n-i-p structure, while poly (3,4-ethylene dioxythiophene) polystyrene sulfonate polymer (PEDOT: PSS) is usually applied in p-i-n structure. The superior performance of PTAA-based PSCs arises from the exceptional hole-mobility of PTAA (%4 Â 10 À3 cm 2 V À1 s À1 ) [103] as compared to other polymers, as well as its strong chemical interaction with perovskites. [104] Especially, the device with PTAA has a photoelectric conversion efficiency (PCE) of over 23%.…”

Simple and robust phenoxazine phosphonic acid molecules as self-assembled hole selective contacts for high-performance inverted perovskite solar cells

“…[8][9][10] Besides, HSMs in the inverted PSCs should keep structure stability under light soaking and heat damping without the degradation of both transmittance and charge transport. Although some materials have been employed as HSMs, including popular materials such as NiO x , [11][12][13][14] PTAA, 15,16 and PEDOT:PSS, 17,18 rationally designed molecules are still necessary to meet the above-mentioned requirements. For example, some rationally-designed organic semiconductors with the D-A-D structure were reported by our group and other colleagues, obtaining a good device performance.…”