Renewed Prospects for Organic Photovoltaics

Chemical Reviews, Journal Year: 2022, Volume and Issue: 122(18), P. 14180 - 14274

Published: Aug. 5, 2022

Organic photovoltaics (OPVs) have progressed steadily through three stages of photoactive materials development: (i) use poly(3-hexylthiophene) and fullerene-based acceptors (FAs) for optimizing bulk heterojunctions; (ii) development new donors to better match with FAs; (iii) non-fullerene (NFAs). The application NFAs an A–D–A configuration (where A = acceptor D donor) has enabled devices efficient charge generation small energy losses (Eloss < 0.6 eV), resulting in substantially higher power conversion efficiencies (PCEs) than FA-based devices. discovery Y6-type (Y6 2,2′-((2Z,2′Z)-((12,13-bis(2-ethylhexyl)-3,9-diundecyl-12,13-dihydro-[1,2,5]-thiadiazolo[3,4-e]-thieno[2″,3″:4′,5′]thieno-[2′,3′:4,5]pyrrolo-[3,2-g]thieno-[2′,3′:4,5]thieno-[3,2-b]indole-2,10-diyl)bis(methanylylidene))bis(5,6-difluoro-3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile) A–DA′ D–A further propelled the PCEs go beyond 15% due smaller Eloss values (∼0.5 eV) external quantum efficiencies. Subsequently, Y6-series single-junction increased >19% may soon approach 20%. This review provides update recent progress OPV following aspects: developments novel donors, understanding structure–property relationships underlying mechanisms state-of-the-art OPVs, tasks underpinning commercialization such as device stability, module development, potential applications, high-throughput manufacturing. Finally, outlook prospects section summarizes remaining challenges technology.

Language: Английский

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Layer‐by‐Layer Processed Ternary Organic Photovoltaics with Efficiency over 18%

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(12)

Published: Feb. 18, 2021

Abstract Obtaining a finely tuned morphology of the active layer to facilitate both charge generation and extraction has long been goal in field organic photovoltaics (OPVs). Here, solution resolve above challenge via synergistically combining layer‐by‐layer (LbL) procedure ternary strategy is proposed demonstrated. By adding an asymmetric electron acceptor, BTP‐S2, with lower miscibility binary donor:acceptor host PM6:BO‐4Cl, vertical phase distribution can be formed donor‐enrichment at anode acceptor‐enrichment cathode OPV devices during LbL processing. In contrast, LbL‐type OPVs based on PM6:BO‐4Cl still show bulk‐heterojunction like morphology. The formation not only reduce recombination but also promote collection, thus enhancing photocurrent fill factor OPVs. Consequently, exhibit best efficiency 18.16% (certified: 17.8%), which among highest values reported date for work provides facile effective approach achieving high‐efficiency expected morphologies, demonstrates as being promising fabricating from present laboratory study future industrial production.

Language: Английский

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Organic Solar Cells with 18% Efficiency Enabled by an Alloy Acceptor: A Two‐in‐One Strategy

Advanced Materials, Journal Year: 2021, Volume and Issue: 33(27)

Published: May 28, 2021

Abstract The trade‐off between the open‐circuit voltage ( V oc ) and short‐circuit current density J sc has become core of organic photovoltaic research, realizing minimum energy offsets that can guarantee effective charge generation is strongly desired for high‐performance systems. Herein, a ternary solar cell with power conversion efficiency over 18% using large‐bandgap polymer donor, PM6, small‐bandgap alloy acceptor containing two structurally similar nonfullerene acceptors (Y6 AQx‐3) reported. This system take full advantage irradiation forms favorable morphology. By varying ratio acceptors, delicate regulation levels achieved, thereby affecting dynamics in devices. optimal device exhibits more efficient hole transfer exciton separation than PM6:AQx‐3‐based reduced loss compared PM6:Y6‐based system, contributing to better performance. Such “two‐in‐one” strategy, which synergizes highly compatible provides promising path boosting performance

Language: Английский

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Selenium Heterocyclic Electron Acceptor with Small Urbach Energy for As-Cast High-Performance Organic Solar Cells

Journal of the American Chemical Society, Journal Year: 2020, Volume and Issue: 142(44), P. 18741 - 18745

Published: Oct. 21, 2020

Typical organic photovoltaic materials show high Urbach energies (ca. 25–50 meV), which is considerably higher than those of their inorganic counterparts and limits further improvement in the device efficiency solar cells (OSCs). In this study, we introduce a facile method selenium substitution to reduce energy 20.4 meV (Y6Se), lowest value reported for high-performance very close 15 meV) typical inorganic/hybrid semiconductors, such as crystalline silicon, gallium nitride, lead-halide perovskite. Next, OSCs based on Y6Se showed 17.7% efficiency, among best results record as-cast single junction date.

Language: Английский

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Machine learning for high performance organic solar cells: current scenario and future prospects

Energy & Environmental Science, Journal Year: 2020, Volume and Issue: 14(1), P. 90 - 105

Published: Nov. 26, 2020

In this review, current research status about the machine learning use in organic solar cell is reviewed. We have discussed challenges anticipating data driven material design.

Language: Английский

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Desired open-circuit voltage increase enables efficiencies approaching 19% in symmetric-asymmetric molecule ternary organic photovoltaics

Joule, Journal Year: 2022, Volume and Issue: 6(3), P. 662 - 675

Published: Feb. 25, 2022

Language: Английский

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Simple Non‐Fused Electron Acceptors Leading to Efficient Organic Photovoltaics

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(23), P. 12964 - 12970

Published: April 2, 2021

Abstract Despite the remarkable progress achieved in recent years, organic photovoltaics (OPVs) still need work to approach delicate balance between efficiency, stability, and cost. Herein, two fully non‐fused electron acceptors, PTB4F PTB4Cl, are developed via a two‐step synthesis from single aromatic units. The introduction of two‐dimensional chain halogenated terminals for these acceptors plays synergistic role optimizing their solid stacking orientation, thus promoting an elongated exciton lifetime fast charge‐transfer rate bulk heterojunction blends. As result, upon blending with PBDB‐TF polymer, has enabled single‐junction OPVs power conversion efficiencies 12.76 %, representing highest values among reported unfused so far.

Language: Английский

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Fine-tuning of side-chain orientations on nonfullerene acceptors enables organic solar cells with 17.7% efficiency

Energy & Environmental Science, Journal Year: 2021, Volume and Issue: 14(6), P. 3469 - 3479

Published: Jan. 1, 2021

Regulating side-chain orientations of Y-series NFAs is a promising strategy to achieve favorable morphology, and high charge mobility solar cell performances, which enables high-performance devices with efficiency approaching 18%.

Language: Английский

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Ternary Blend Organic Solar Cells: Understanding the Morphology from Recent Progress

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(46)

Published: Nov. 19, 2021

Ternary blend organic solar cells (TB-OSCs) incorporating multiple donor and/or acceptor materials into the active layer have emerged as a promising strategy to simultaneously improve overall device parameters for realizing higher performances than binary devices. Whereas introducing also results in more complicated morphology their counterparts. Understanding is crucially important further improving performance of TB-OSC. This review introduces solubility and miscibility that affect ternary blends. Then, this summarizes recent processes study on blends from aspects molecular crystallinity, packing orientation, domain size purity, directly observation morphology, vertical phase separation well morphological stability. Finally, summary prospects TB-OSCs are concluded.

Language: Английский

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Near‐Infrared Materials: The Turning Point of Organic Photovoltaics

Advanced Materials, Journal Year: 2021, Volume and Issue: 34(10)

Published: Oct. 28, 2021

Abstract Near‐infrared (NIR)‐absorbing organic semiconductors have opened up many exciting opportunities for photovoltaic (OPV) research. For example, new chemistries and synthetical methodologies been developed; especially, the breakthrough Y‐series acceptors, originally invented by our group, specifically Y1, Y3, Y6, contributed immensely to boosting single‐junction solar cell efficiency around 19%; novel device architectures such as tandem transparent photovoltaics realized. The concept of NIR donors/acceptors thus becomes a turning point in OPV field. Here, development NIR‐absorbing materials OPVs is reviewed. According low‐energy absorption window, here, (p‐type (polymers) n‐type (fullerene nonfullerene)) are classified into four categories: 700–800 nm, 800–900 900–1000 greater than 1000 nm. Each subsection covers design, synthesis, utilization various types donor (D) acceptor (A) units. structure–property relationship between kinds D, A units window constructed satisfy requirements different applications. Subsequently, variety applications realized materials, including OPVs, photodetectors, presented. Finally, challenges future next‐generation beyond discussed.

Language: Английский

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