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

---

New Phase for Organic Solar Cell Research: Emergence of Y-Series Electron Acceptors and Their Perspectives

ACS Energy Letters, Journal Year: 2020, Volume and Issue: 5(5), P. 1554 - 1567

Published: April 7, 2020

With the recent emergence of a new class high-performance nonfullerene acceptors (NFAs), organic solar cells (OSCs) have entered phase research featuring high power conversion efficiencies (PCEs). In this Perspective, we summarize progress made from Y-series NFAs and matched polymer donors analyze molecular design strategies for boosting device performance. We also perform PCE prediction OSCs propose requirements NFAs, aiming at 20%, which is comparable to those Si perovskite-based counterparts. Finally, assess three factors efficiency, stability, cost outline challenges facing future development directions OSCs. This work expected provide valuable suggestions with comprehensive view advance practical application

Language: Английский

---

Recent progress in organic solar cells (Part I material science)

Science China Chemistry, Journal Year: 2021, Volume and Issue: 65(2), P. 224 - 268

Published: Dec. 27, 2021

Language: Английский

---

Asymmetric Electron Acceptors for High‐Efficiency and Low‐Energy‐Loss Organic Photovoltaics

Advanced Materials, Journal Year: 2020, Volume and Issue: 32(24)

Published: May 11, 2020

Low energy loss and efficient charge separation under small driving forces are the prerequisites for realizing high power conversion efficiency (PCE) in organic photovoltaics (OPVs). Here, a new molecular design of nonfullerene acceptors (NFAs) is proposed to address above two issues simultaneously by introducing asymmetric terminals. Two NFAs, BTP-S1 BTP-S2, constructed halogenated indandione (A1 ) 3-dicyanomethylene-1-indanone (A2 as different conjugated terminals on central fused core (D), wherein they share same backbone well-known NFA Y6, but at Such NFAs with A1 -D-A2 structure exhibit superior photovoltaic properties when blended polymer donor PM6. Energy analysis reveals that molecule BTP-S2 six chlorine atoms attached enables corresponding devices give an outstanding electroluminescence quantum 2.3 × 10-2 %, one order magnitude higher than based symmetric Y6 (4.4 10-3 %), thus significantly lowering nonradiative devices. Besides, multiple halogen fast hole transfer As result, OPVs PM6:BTP-S2 blend realize PCE 16.37%, (15.79%) PM6:Y6-based OPVs. A further optimization ternary (PM6:Y6:BTP-S2) results best 17.43%, which among highest efficiencies single-junction This work provides effective approach lower promote strategy.

Language: Английский

---

High-performance and eco-friendly semitransparent organic solar cells for greenhouse applications

Joule, Journal Year: 2021, Volume and Issue: 5(4), P. 945 - 957

Published: March 19, 2021

Language: Английский

---

Small reorganization energy acceptors enable low energy losses in non-fullerene organic solar cells

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: June 7, 2022

Minimizing energy loss is of critical importance in the pursuit attaining high-performance organic solar cells. Interestingly, reorganization plays a crucial role photoelectric conversion processes. However, understanding relationship between and losses has rarely been studied. Here, two acceptors, Qx-1 Qx-2, were developed. The energies these acceptors during processes are substantially smaller than conventional Y6 acceptor, which beneficial for improving exciton lifetime diffusion length, promoting charge transport, reducing originating from dissociation non-radiative recombination. So, high efficiency 18.2% with open circuit voltage above 0.93 V PM6:Qx-2 blend, accompanies significantly reduced 0.48 eV. This work underlines achieving small paves way to obtain

Language: Английский

---

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

---

High‐Performance Semitransparent Organic Solar Cells with Excellent Infrared Reflection and See‐Through Functions

Advanced Materials, Journal Year: 2020, Volume and Issue: 32(32)

Published: July 1, 2020

Abstract Clean energy production and saving play vital impacts on the sustainability of global community. Herein, high‐performance semitransparent organic solar cells (ST‐OSCs) with excellent features power generation, being see‐through, infrared reflection heat dissipation, promising perspectives for building‐integrated photovoltaics (BIPVs) are reported. To simultaneously improve average visible transmittance (AVT) conversion efficiency (PCE), formally in a trade‐off relationship, ST‐OSCs, new ternary blends alloy‐like near‐infrared (NIR) acceptors employed, which effective to device while maintaining absorption unchanged, resulting PCEs 16.8% opaque devices 13.1% OSCs (AVT 22.4% photon radiation rejection (IRR) 77%). Further, multifunctional ST‐OSCs realized via introducing simple, yet photonic reflectors, together optical simulation, leading not only perfect fitting peak (555 nm) photopic response human eye but also an IRR 90% (780–2500 nm), along 23% AVT over 12% PCE. This is thought be best‐performing ST‐OSC prospects as BIPVs terms see‐through.

Language: Английский

---

Systematic Merging of Nonfullerene Acceptor π-Extension and Tetrafluorination Strategies Affords Polymer Solar Cells with >16% Efficiency

Journal of the American Chemical Society, Journal Year: 2021, Volume and Issue: 143(16), P. 6123 - 6139

Published: April 13, 2021

The end-capping group (EG) is the essential electron-withdrawing component of nonfullerene acceptors (NFAs) in bulk heterojunction (BHJ) organic solar cells (OSCs). To systematically probe impact two frequent EG functionalization strategies, π-extension and halogenation, A-DAD-A type NFAs, we synthesized characterized four such NFAs: BT-BIC, LIC, L4F, BO-L4F. assess relative importance these contrast NFAs with baseline acceptors, Y5 Y6. Up to 16.6% power conversion efficiency (PCE) binary inverted OSCs BT-BO-L4F combining halogenation was achieved. When factors are combined, effect on optical absorption cumulative. Single-crystal π–π stacking distances similar for strategies π-extension. Increasing alkyl substituent length from BT-L4F significantly alters packing motif eliminates core interactions BT-L4F. Electronic structure computations reveal some largest NFA electronic couplings observed date, 103.8 meV 47.5 BT-BO-L4F. Computed reorganization energies, 132 133 BT-BO-L4F, respectively, also lower than Y6 (150 meV). BHJ blends show preferential π-face-on orientation, both fluorination increase crystallinity. Femto/nanosecond transient spectroscopy (fs/nsTA) integrated photocurrent device analysis (IPDA) indicate that modifies phase separation enhance film ordering carrier mobility, while suppresses unimolecular recombination. This systematic study highlights synergistic effects affording efficient provides insights into designing next-generation materials.

Language: Английский

---

Unveiling structure-performance relationships from multi-scales in non-fullerene organic photovoltaics

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: July 30, 2021

Abstract Unveiling the correlations among molecular structures, morphological characteristics, macroscopic properties and device performances is crucial for developing better photovoltaic materials achieving higher efficiencies. To achieve this goal, a comprehensive study performed based on four state-of-the-art non-fullerene acceptors (NFAs), which allows to systematically examine above-mentioned from different scales. It’s found that extending conjugation of NFA shows positive effects charge separation promotion non-radiative loss reduction, while asymmetric terminals can maximize benefits both terminals. Another optimization alkyl chain tuning. The shortened side results in strengthened terminal packing decreased π-π distance, contribute high carrier mobility finally collection efficiency. With most-acquired structure factors, PM6:BTP-S9-based organic photovoltaics (OPVs) exhibit optimal efficiency 17.56% (certified: 17.4%) with fill factor 78.44%, representing best acceptor OPVs. This work provides insight into structure-performance relationships, paves way toward high-performance OPVs via design.

Language: Английский

---