The evolution of triphenylamine hole transport materials for efficient perovskite solar cells

Abstract

This review article guides readers to explore new avenues for discovering efficient triphenylamine hole-transporting materials to aid in the future development and advancement of novel hole-transporting materials for the stable performance of perovskite solar cells for their commercial applications.

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

“…The ideal hole selective materials (HSMs) should meet the following requirements: (i) extract and transport holes from the perovskite to anode, (ii) improve the energy-level alignment to reduce energy loss by recombination, and (iii) reduce interfacial defect density and induce the nucleation and high-quality growth of the above perovskite films. [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.…”

Efficient furan-bridged dibenzofulvene-triphenylamine hole transporting materials for perovskite solar cells

“…Of these, small-molecular HTMs have attracted much attention because of the minor differences among different batches, the easy solution preparation process, and the fact that their molecular properties can be optimized by cutting and tuning the molecular structure. 10,11 To date, small-molecular 2,2 0 ,7, 7 0 -tetrakis(N,N-di-p-methoxyphenyl)-amine-9,9 0 -spirobifluorene (spiro-OMeTAD) is a commonly used HTM, and devices using this material have the highest PCE of PSCs. 4,12 However, the complex preparation process and inferior hole mobility of spiro-OMeTAD led to the development of a lot of new alternatives with varied building blocks.…”

Controlling Molecular Orientation of Small Molecular Dopant-Free Hole-Transport Materials: Toward Efficient and Stable Perovskite Solar Cells

“…Furthermore, recent studies indicate that the interaction between inorganic HTMs and perovskites may accelerate the aging of PSCs [ 22 , 28 ]. The above limitations of polymeric and inorganic HTMs have paved the way for the development of small molecular HTMs [ 29 ]. Recently, dopant-free small molecular HTMs have achieved impressive progress.…”