Perylene Diimide‐Based Electron‐Transporting Material for Perovskite Solar Cells with Undoped Poly(3‐hexylthiophene) as Hole‐Transporting Material

Abstract

Perylene diimide‐based small molecules are widely used as intermediates of liquid crystals, owing to their high planarity and electron mobility. In this study, tetrachloroperylene diimide (TCl‐PDI) was used as a small‐molecule replacement for TiO2 as electron‐transporting material (ETM) for planar perovskite solar cells (PVSCs). Among hole‐transporting materials (HTMs) for PVSCs, poly(3‐hexylthiophene) (P3HT) gives the devices the highest stability and reproducibility. Therefore, PVSCs with the structure of indium tin oxide (ITO)/ETM/perovskite/P3HT/MoO3/Ag were used to evaluate the performances of new ETMs. A reference device with compact TiO2 and P3HT gave a reasonable power conversion efficiency (PCE) of 12.78 %, whereas the PVSC with TCl‐PDI as ETM gave an enhanced PCE of 14.73 %, which is among the highest reported values for PVSCs with undoped P3HT as the HTM. Moreover, TCl‐PDI‐based devices displayed higher stability than those based on compact TiO2, owing to the superior perovskite quality.

Dopant‐Free, Donor–Acceptor‐Type Polymeric Hole‐Transporting Materials for the Perovskite Solar Cells with Power Conversion Efficiencies over 20%

“…Similar XRD patterns were observed for bare perovskite and the perovskite covered with PBDTT or PBTTT. The XRD patterns also confirmed the formation of the black phase of the perovskite because they contained diffractions from the (101), (012), (021), (202), (211), (122), (024), and (131) planes of the perovskite lattice . Water contact angles of PBDTT and PBTTT were 99.1° and 89.8°, respectively, which are much higher than that of spiro‐OMeTAD (72.0°) (Figure S3, Supporting Information).…”

Carbon-based materials for stable, cheaper and large-scale processable perovskite solar cells

“…50,51 The ETM usually consists of TiO 2 or another n-type semiconductor anode, [52][53][54] while the back electrode is deposited on top of the HTM. [55][56][57] For efficient charge extraction, the valence band (VB) and the conduction band of the perovskite should lie below the highest occupied molecular orbital (HOMO) of the HTM and under the lowest unoccupied molecular orbital (LUMO) of the ETM, respectively. 58,59 After light absorption, in the perovskite layer an electron-hole pair is generated.…”

Fluorescein-bridged Perylene Bisimide Dimer for Use as Liquid Crystal: Studies on Mesomorphic and Fluorescence Properties

“…The residue was further puri ed by a silica gel column (DCM/petroleum ether (2:1, v/v)) to give compound 3 as a red solid in yield of 70%. FT-IR (KBr), ν/cm -1 : 1698, 1660 (C=O); 1…”

“…Boasting the natural virtues of fascinating photophysical properties (e.g., longer excitation wavelength, high uorescence quantum yield, long uorescence lifetime, and the stability to light and thermalexposure), perylene bisimide (PBI) is a recurring and overwhelming motif in various elds of solar photovoltaics [1][2][3][4], organic electronic devices [5,6], photoelectrocatalysis [7], photoisomerization [8], nearinfrared photothermal conversion [9], phosphorescence [10], moisture detection [11], bioimaging [12,13], theranostics [14,15], and biosensing/bioassay [16]. Additionally, the self-assembled π-π interaction of perylene core plays a decisive role in its functional characteristic and renders it possible to develop various supramolecular species involving host-guest recognition [17,18], gelator [19][20][21], LCs [22], and so on.…”