Self‐Assembled Interlayer Enables High‐Performance Organic Photovoltaics with Power Conversion Efficiency Exceeding 20%

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(25)

Published: March 21, 2024

Interfacial layers (ILs) are prerequisites to form the selective charge transport for high-performance organic photovoltaics (OPVs) but mostly result in considerable parasitic absorption loss. Trimming ILs down a mono-molecular level via self-assembled monolayer is an effective strategy mitigate However, such suffers from inferior electrical contact with low surface coverage on rough surfaces and poor producibility. To address these issues, here, interlayer (SAI) developed, which involves thin layer of 2-6 nm full substrate both covalent van der Waals bonds by using molecule 2-(9H-carbazol-9-yl) (2PACz). Via facile spin coating without further rinsing annealing process, it not only optimizes optical properties OPVs, enables world-record efficiency 20.17% (19.79% certified) also simplifies tedious processing procedure. Moreover, SAI especially useful improving absorbing selectivity semi-transparent record light utilization 5.34%. This work provides optimize OPVs solar window applications.

Language: Английский

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Compact Hole‐Selective Self‐Assembled Monolayers Enabled by Disassembling Micelles in Solution for Efficient Perovskite Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(46)

Published: July 24, 2023

Self-assembled monolayers (SAMs) are widely employed as effective hole-selective layers (HSLs) in inverted perovskite solar cells (PSCs). However, most SAM molecules amphiphilic nature and tend to form micelles the commonly used alcoholic processing solvents. This introduces an extra energetic barrier disassemble during binding of on substrate surface, limiting formation a compact SAM. To alleviate this problem for achieving optimal growth, co-solvent strategy carbazole-based solution is developed. effectively increases critical micelle concentration be above enhances reactivity phosphonic acid anchoring group allow densely packed SAMs formed indium tin oxide. Consequently, PSCs derived from using MeO-2PACz, 2PACz, CbzNaph HSLs show universally improved performance, with SAM-derived device champion efficiency 24.98% stability.

Language: Английский

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Co‐Self‐Assembled Monolayers Modified NiO_x for Stable Inverted Perovskite Solar Cells

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(16)

Published: Jan. 11, 2024

Abstract [4‐(3,6‐dimethyl‐9H‐carbazol‐9yl)butyl]phosphonic acid (Me‐4PACz) self‐assembled molecules (SAM) are an effective method to solve the problem of buried interface NiO x in inverted perovskite solar cells (PSCs). However, Me‐4PACz end group (carbazole core) cannot forcefully passivate defects at bottom film. Here, a Co‐SAM strategy is employed modify PSCs. doped with phosphorylcholine chloride (PC) form improve monolayer coverage and reduce leakage current. The phosphate ions (Cl − ) PC can inhibit surface defects. Meantime, quaternary ammonium Cl fill organic cations halogen vacancies film enable passivation. Moreover, promote growth crystals, collaboratively defects, suppress nonradiative recombination, accelerate carrier transmission, relieve residual stress Consequently, modified devices show power conversion efficiencies as high 25.09% well excellent device stability 93% initial efficiency after 1000 h operation under one‐sun illumination. This work demonstrates novel approach for enhancing performance PSCs by modifying on .

Language: Английский

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High Open‐Circuit Voltage (1.197 V) in Large‐Area (1 cm²) Inverted Perovskite Solar Cell via Interface Planarization and Highly Polar Self‐Assembled Monolayer

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(8)

Published: Jan. 2, 2024

Abstract The efficiency loss caused by area scaling is one of the key factors hindering industrial development perovskite solar cells. energy and contact issues in buried interface are main reasons. Here, a new self‐assembled monolayer (SAM), Ph‐4PACz, with large dipole moment (2.32 D) obtained . It found that Ph‐4PACz high polarity can improve band alignment minimize , resulting an open‐circuit voltage ( V oc ) as 1.2 for 1.55 eV perovskite. However, when applied to large‐area devices, fill factor (FF) still suffered from significant attenuation. Therefore, alumina nanoparticles (Al 2 O 3 ‐NPs) introduced between rough FTO substrate further flatness conformal film almost no voids interface, thus promoting low exciton binding energy, fast hot‐carrier extraction non‐radiative recombination. final devices achieved small‐area power conversion (PCE) 25.60% (1 cm PCE 24.61% (certified at 24.48%), which represents highest single device ≥ 1 area. Additionally, mini‐modules stability testing also carried out demonstrate feasibility commercialization.

Language: Английский

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Rational molecular design of multifunctional self-assembled monolayers for efficient hole selection and buried interface passivation in inverted perovskite solar cells

Chemical Science, Journal Year: 2024, Volume and Issue: 15(8), P. 2778 - 2785

Published: Jan. 1, 2024

Self-assembled monolayers (SAMs) have been widely employed as the bottom-contact hole-selective layer (HSL) in inverted perovskite solar cells (PSCs). Besides manipulating electrical properties, molecularly engineering SAM provides an opportunity to modulate buried interface. Here, we successfully introduced Lewis-basic oxygen and sulfur heteroatoms through rational molecular design of asymmetric SAMs obtain two novel multifunctional SAMs, CbzBF CbzBT. Detailed characterization single-crystal structures device interfaces shows that enhanced packing, more effective ITO work function adjustment, interface passivation were achieved. Consequently, champion PSC employing CbzBT showed excellent power conversion efficiency (PCE) 24.0% with a high fill factor 84.41% improved stability. This demonstrates feasibility introducing defect-passivating heterocyclic groups into molecules help passivate interfacial defects PSCs. The insights gained from this strategy will accelerate development new HSLs for efficient

Language: Английский

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Lead halide coordination competition at buried interfaces for low V_OC-deficits in wide-bandgap perovskite solar cells

Energy & Environmental Science, Journal Year: 2023, Volume and Issue: 16(12), P. 5992 - 6002

Published: Jan. 1, 2023

A simple and straightforward interface engineering strategy, using stacked layers of small molecules (2PACz/Me-4PACz) as hole-selective layers, resulted in the formation a dense buried perovskite film.

Language: Английский

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Defect‐Passivating and Stable Benzothiophene‐Based Self‐Assembled Monolayer for High‐Performance Inverted Perovskite Solar Cells

Advanced Energy Materials, Journal Year: 2024, Volume and Issue: 14(12)

Published: Jan. 12, 2024

Abstract Effective passivation of defects at the buried interface between perovskite absorber and hole‐selective layer (HSL) is crucial for achieving high performance in inverted solar cells (PSCs). Additionally, HSL needs to possess compact molecular packing intrinsic photo‐ thermo‐stability ensure long‐term operation devices. In this study, a novel MeO‐BTBT‐based self‐assembled monolayer (SAM) reported serve as an efficient PSCs. Compared well‐established carbazole‐containing SAM MeO‐2PACz, MeO‐BTBT has flat more extended conjugation with large atomic radius sulfur atom. These induce stronger intermolecular interactions enable ordered be formed on indium–tin oxide (ITO) substrates. Meanwhile, atoms can coordinate Pb 2+ ions passivate absorber. The derived films show both photoluminescence (PL) quantum yield (13.2%) long lifetime (7.2 µs). PSCs based PCE 24.53% impressive fill factor 85.3%. PCEs devices maintain ≈95% their initial values after being aged 65 °C than 1000 h or continuous under 1‐sun illumination.

Language: Английский

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Recent Advances of Inverted Perovskite Solar Cells

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(4), P. 1487 - 1506

Published: March 12, 2024

Inverted perovskite solar cells (PSCs) with p-i-n structure have recently attracted widespread attention owing to their fast-growing power conversion efficiency. In this Review, we focus on the progress in materials that contribute improved efficiency of inverted PSCs, including hole transport self-assembled monolayers as highlight, electron materials, and interface modification between charge layers for passivating defects. Then, discuss recent advances perovskites, optimization bandgap, interfacial band engineering, development film processing. Finally, point out challenges future perspectives further improving stability PSCs hope offering suggestions tackle hindrance commercial applications.

Language: Английский

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High‐Efficiency Inverted Perovskite Solar Cells via In Situ Passivation Directed Crystallization

Advanced Materials, Journal Year: 2024, Volume and Issue: 36(41)

Published: Aug. 14, 2024

Abstract Lead halide perovskite solar cells (PSCs) have emerged as one of the influential photovoltaic technologies with promising cost‐effectiveness. Though mild processabilities to massive production, inverted PSCs long suffered from inferior performances due intractable defective states at boundaries and interfaces. Herein, an in situ passivation (ISP) method is presented effectively adjust crystal growth kinetics obtain well‐orientated films passivated interfaces, successfully enabled new access high‐performance PSCs. The study unravels that strong yet anisotropic ISP additive adsorption between different facets accompanied engineering yield high‐quality (111)‐orientated crystallites superior properties. ISP‐derived achieved remarkable power conversion efficiencies (PCEs) 26.7% (certified 26.09% a 5.97 mm 2 active area) 24.5% 23.53% 1.28 cm area), along decent operational stabilities.

Language: Английский

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Understanding the Role of Crown Ether Functionalization in Inverted Perovskite Solar Cells

ACS Energy Letters, Journal Year: 2024, Volume and Issue: 9(4), P. 1518 - 1526

Published: March 14, 2024

Inverted p-i-n structure perovskite solar cells (PSCs) have attracted considerable attention in consideration of high-efficiency, long-term stability, and cost reduction, which represent the key challenges advancing commercialization PSCs. In order to address issue defect-related nonradiative recombination, we enhanced interfacial passivation between layer electron transfer with crown ether derivatives By a combination first-principles calculations, photoluminescence (PL) time-resolved (TRPL) spectra, grazing-incidence wide-angle X-ray scattering (GIWAXS) characterization, provided an understanding mechanism obtained efficiency 23.3% NiOx-based PSCs, lowered recombination 25% voltage losses. Furthermore, unencapsulated PSCs kept 92% initial following 1224 h aging, demonstrated remarkable stability. The inverted could provide great potential for high-efficiency stable PSC designs promote

Language: Английский

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