Thiophene-Based Two-Dimensional Dion–Jacobson Perovskite Solar Cells with over 15% Efficiency

Abstract

Two-dimensional (2D) perovskites are emerging photovoltaic materials because of their highly tunable photophysical properties and improved environmental stability in comparison with 3D perovskites. Here, a thiophene-based bulky dication spacer, namely, 2,5-thiophenedimethyl­ammonium (ThDMA), was developed and applicated in 2D Dion–Jacobson (DJ) perovskite. High-quality 2D DJ perovskite, (ThDMA)­(MA) n–1Pb n I3n+1 (nominal n = 5), with improved crystallinity, preferred vertical orientation, and enlarged spatially resolved carrier lifetime could be achieved by a one-step method using a mixed solvent of DMF/DMSO (v/v, 9:1). The optimized device exhibits a high efficiency of 15.75%, which is a record for aromatic spacer-based 2D DJ perovskite solar cells (PSCs). Moreover, the unencapsulated 2D DJ perovskite devices sustained over 95% of their original efficiency after storage in N2 for 1655 h. Importantly, both the light-soaking stability and thermal stability (T = 80 °C) of the 2D DJ perovksite devices are dramatically improved in comparison with their 3D counterparts. These results indicate that highly efficient and stable 2D DJ PSCs could be achieved by developing thiophene-based aromatic spacers as well as device engineering.

Boosted Responsivity and Tunable Spectral Response in B‐Site Substituted 2D Ca2Nb3−xTaxO10 Perovskite Photodetectors

“…[ 7,8 ] It is found that the ultrathin thickness and large specific area of nanosheets can bring perovskites some attractive optical, photochemical, or electric properties (e.g., high photoluminescence efficiency, large photoconductive gain, etc. ), which expands their potential for fabricating devices with various photo‐induced functionalities such as solar cells [ 9–12 ] and light‐emitting diodes, [ 13,14 ] as well as high‐performance photodetectors (PDs). [ 15,16 ]…”

Influence of the Vibrational Modes from the Organic Moieties in 2D Lead Halides on Excitonic Recombination and Phase Transition

“…2D metal halides are materials that have been receiving increasing attention in the past few years. [ 1–4 ] Owned for their unique optoelectronic properties, these semiconductors are prominent in the development of a series of new‐generation photonic devices such as solar cells, [ 5–8 ] LEDs, [ 9–11 ] and photodetectors. [ 12–14 ] Their structure is commonly compared to 3D metal halide perovskites with structure ABX 3 (where A is monovalent cation, B is a divalent cation, more frequently Pb 2+ and Sn 2+ , and X is a halide different from F − ) and, very commonly, are regarded as reduced dimensional perovskites or 2D perovskites.…”

Reducing Energy Disorder of Hole Transport Layer by Charge Transfer Complex for High Performance p–i–n Perovskite Solar Cells

“…V eff is defined as V eff = V 0 − V app , where V 0 and V app are the voltage when J ph equals zero and the applied bias, respectively. [53,54] The exciton dissociation probability (P diss ) is estimated using the equation P diss = J ph /J sat , where J sat is the saturation photocurrent density. The J sat is mainly related to the absorbed incident photons at high V eff , and it could be defined as the photocurrent, where the photogenerated excitons could be separated into free charge carriers and collected by corresponding electrodes.…”