Dopant-Free Hole-Transport Materials Based on 2,4,6-Triarylpyridine for Inverted Planar Perovskite Solar Cells

Abstract

New building blocks of cores and periphery groups for organic hole-transporting materials (HTMs) have been paid much attention for recent development in perovskite solar cells (PSCs). In this work, we applied facile synthesis to join a 2,4,6-triarylpyridine building block for new HTMs based on a pyridine core by cheap industrial initial materials. The three small molecules, namely, D104, D105, and D106, were used in the pristine state. To the best of our knowledge, pyridine-cored dopant-free HTMs have not been reported in PSCs. The changing periphery 4-methoxyphenyl and bis(4-methoxyphenyl)amine groups formed different Y-shapes. Under 1 sun conditions, the devices achieved an increased power conversion efficiency (PCE) of 16.28%, 17.40%, and 18.24% for D104, D105, and D106. They displayed great potential with improved stability in inverted planar PSCs. The unencapsulated device in ambient environment (30% RH) based on D104, D105, and D106 retained 33%, 70%, and 75% of the initial PCE after 275 h.

Applications of Self‐Assembled Monolayers for Perovskite Solar Cells Interface Engineering to Address Efficiency and Stability

“…After 30 days in ambient conditions, the photovoltaic efficiency of the cells reduced by only 20%. Duan et al [144] improved the device performance and stability by incorporating 2,4,6-Triarylpyridine as an HTM to p-i-n PSCs.…”

“…Duan et al. [ 144 ] improved the device performance and stability by incorporating 2,4,6‐Triarylpyridine as an HTM to p‐i‐n PSCs.…”

Pyridine Bridging Diphenylamine-Carbazole with Linking Topology as Rational Hole Transporter for Perovskite Solar Cells Fabrication

“…The pyridine moiety in these HTM can act as a Lewis base and which in turn can assist defect passivation of perovskite and π-conjugation effect. [24][25][26][27][28] Besides the core of HTMs, the arm is also vital for optimizing the semiconducting properties of HTMs. Up to now, the 6 -tetrakis(4-methoxyphenyl)-9H-carbazole-3,6-diamine) (DANCBZ) moiety have been demonstrated to be a valuable arm for the designing of molecular HTMs owing to their superior charge-transporting ability, stability and low-cost.…”

Pyridine-triphenylamine hole transport material for inverted perovskite solar cells

“…Till now, many studies have shown that pyridine unit could passivate the interface defects effectively and enhance the hole extracting and transporting capability [15,16]. In our previous study, we have tried to introduce pyridine as terminal group to linear HTM, which induces enhanced chemical interaction between perovskite and HTM [17].…”