A saddle-shaped o-tetraphenylene based molecular semiconductor with a high glass transition temperature for perovskite solar cells

Abstract

The application of exotic conjugated skeletons in organic semiconductors is alluring due to the topology related optoelectronic peculiarity. In this paper we explore the design of molecular semiconductors starting from...

Advancements in organic small molecule hole-transporting materials for perovskite solar cells: past and future

“…HTL becomes highly hydrophilic with Li-TFSI, due to its hygroscopic nature. [135][136][137][138][139][140][141] It tends to cause chemical degradation and has an adverse effect on the device stability. Researchers had shown the reaction of tBP with perovskite and dissolve it.…”

“…Using donor-p spacer-donor (D-p-D) molecular conguration, certain low-cost alternative HTM was designed with the combination of conjugated electron-rich cores with arylamine end-caps. [243][244][245][246][247][248][249] At times, the introduction of the electron-rich core leads unfavorable li in HOMO energy level and minimal stability, yet few HTMs prove high efficiency compared to spiro-OMeTAD. With the C and N atoms at the ninth and tenth position successful synthesizing of high purity 4,4 0 -(10-(4-methoxyphenyl)-9,9-dimethyl-9,10-dihydroacridine-2,7-diyl)bis(N,N-bis(4-methoxyphenyl)aniline) (ACR-TPA) is done.…”

Dopant-Free Hole Transporting Material Based on Nonconjugated Adamantane for High-Performance Perovskite Solar Cells

“…In 2020, we synthesized β, β-COTh-Ph-OMeTAD ( Meng et al, 2020 ) and achieved a PCE of 18.53% in inverted planar PSCs. Recently, Wang’s group ( Wang et al, 2021 ) and Ahmad’s group ( Urieta-Mora et al, 2019 ) extended the COTh to COPh (o-tetraphenylene) and COI (tetra-indole) and synthesized OTP-OMeDPA and TTI, achieving a PCE of 21.5 and 19.23% in regular mesoporous PSCs, respectively. All these results demonstrate that even when the conjugate of backbones are partially destroyed with a flexible 3D structure of cyclooctatetraene in HTMs, they still can lead to high-performance PSCs.…”