Minh Anh Truong

Hole-collecting monolayers have drawn attention in perovskite solar cell research due to their ease of processing, high performance, and good durability. Since molecules in the hole-collecting monolayer are typically composed of functionalized π-conjugated structures, hole extraction is expected to be more efficient when the π-cores are oriented face-on with respect to the adjacent surfaces. However, strategies for reliably controlling the molecular orientation in monolayers remain elusive. In t

Two kinds of ladder-type π-conjugated compounds, benzofuro[3,2-b]indoles (BFIs) and indolo[3,2-b]indoles (IIs), were successfully synthesized using palladium-catalyzed double N-arylation of anilines with the corresponding dihalobiaryls. Photophysical properties were evaluated by UV-vis and photoluminescence spectroscopies and theoretical calculations. BFI derivatives showed higher quantum yields (33-39%) than the II derivative (29%). The absorption bands of the II derivative were more red-shifte

A series of two-dimensionally expanded azulene-core-based π systems have been synthesized with different alkyl chain lengths in the alkoxy moieties connected to the partially oxygen-bridged triarylamine skeletons. The thermal, photophysical, and electronic properties of each compound were evaluated to determine the influence of the alkyl chain length on their effectiveness as hole-transporting materials (HTMs) in perovskite solar cells (PSCs). All the synthesized molecules showed promising mater

Hole-collecting monolayers have greatly advanced the development of positive-intrinsic-negative perovskite solar cells (p-i-n PSCs). To date, however, most of the anchoring groups in the reported monolayer materials are designed to bind to the transparent conductive oxide (TCO) surface, resulting in less availability for other functions such as tuning the wettability of the monolayer surface. In this work, we developed two anchorable molecules, 4PATTI-C3 and 4PATTI-C4, by employing a saddle-like

Organic semiconducting materials that are optically transparent in the near-ultraviolet (NUV) region from 300 to 400 nm are needed for advanced perovskite devices such as bifacial semitransparent and tandem solar cells. In this study, three organic semiconducting materials, HND-NAr2, HND-DTP, and HND-Cbz, were designed and synthesized by introducing bis(4-methoxyphenyl)amine, dithieno[3,2-b:2′,3′-d]pyrrole, and carbazole, respectively, into the head position of partially oxygen-bridged triphenyl

Ladder-type π-conjugated compounds containing a benzo[2,1-b:3,4-b']difuran skeleton, such as dibenzo[d,d']benzo[2,1-b:3,4-b']difuran (syn-DBBDF) and dinaphtho[2,3-d:2',3'-d']benzo[2,1-b:3,4-b']difuran (syn-DNBDF) were synthesized. Their photophysical and electrochemical properties were revealed by UV-vis absorption and photoluminescence spectroscopy and cyclic voltammetry. Organic field-effect transistors (OFETs) were fabricated with these compounds as organic semiconductors, and their semicondu

High-performance and cost-effective hole-collecting materials (HCMs) are indispensable for commercially viable perovskite solar cells (PSCs). Here, we report an anchorable HCM composed of a triazatruxene core connected with three alkyl carboxylic acid groups (<b>3CATAT-C3</b>). In contrast to the phosphonic acid-containing tripodal analog (<b>3PATAT-C3</b>), <b>3CATAT-C3</b> molecules can form a hydrophilic monolayer on a transparent conducting oxide surface, which is beneficial for subsequent p

Abstract Two kinds of ladder-type thiophene-fused π-conjugated compounds, benzo[2,1-b:3,4-b′]bis[1]benzothiophene (syn-BBBT) and dinaphtho[2,3-d:2′,3′-d′]benzo[2,1-b:3,4-b′]dithio-phene (syn-DNBDT), were successfully synthesized. Photophysical and electrochemical properties were evaluated by UV–vis and photoluminescence spectroscopies and cyclic voltammetry as well as theoretical calculations. These properties were compared with those of structural isomers and oxygen analogs to reveal the effect

Four polythiophene derivatives including regiorandom polymers P1, P2, and P3 and a regioregular polymer P4, containing a phenyl side chain with electron-withdrawing carbonyl groups such as an ester and a ketone at the 3-position of the thiophene ring, were synthesized by Stille coupling reaction. Bulk-heterojunction polymer solar cells (PSCs) based on these polymers as p-type semiconductors and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) were fabricated, and their photovoltaic performances

The development of hole-collecting materials is indispensable to improving the performance of perovskite solar cells (PSCs). To date, several anchorable molecules have been reported as effective hole-collecting monolayer (HCM) materials for p-i-n PSCs. However, their structures are limited to well-known electron-donating skeletons, such as carbazole, triarylamine, etc. In this work, we developed a series of squaraine derivatives that have a π-conjugated core composed of a squaric acid moiety con

The phosphole ring is known as a useful building block for constructing π-conjugated organic materials. Here, we report ladder-type benzophospholo[3,2-<i>b</i>]indole (BPI) derivatives where the phosphole and the pyrrole rings are directly fused. Compounds <b>8a</b>-<b>8d</b> with different aryl groups on the phosphorous center were successfully synthesized, and the solid-state structure of <b>8a</b> was confirmed using X-ray crystallographic analysis. The BPIs exhibit relatively high fluorescen

A research-grade perovskite solar cell in a natural environment is depicted on the cover art. The device is converting the bright sunlight to clean electricity, suggested by the healthy green vegetation in the surroundings. Also represented are tokens of the authors′ country and town, Mt. Fuji and Byodoin Temple. In the sky are the cloudlike azulene-core based hole transport molecules reported in the paper. Multiple conformations of these molecules, responsible for their key material properties,

Abstract Hole‐collecting monolayers have greatly advanced the development of positive‐intrinsic‐negative perovskite solar cells (p‐i‐n PSCs). To date, however, most of the anchoring groups in the reported monolayer materials are designed to bind to the transparent conductive oxide (TCO) surface, resulting in less availability for other functions such as tuning the wettability of the monolayer surface. In this work, we developed two anchorable molecules, 4PATTI‐C3 and 4PATTI‐C4 , by employing a s