Single‐Junction Organic Solar Cells with 19.17% Efficiency Enabled by Introducing One Asymmetric Guest Acceptor

Advanced Materials, Journal Year: 2022, Volume and Issue: 34(26)

Published: April 19, 2022

The ternary strategy has been widely identified as an effective approach to obtain high-efficiency organic solar cells (OSCs). However, for most OSCs, the nonradiative voltage loss lies between those of two binary devices, which limits further efficiency improvements. Herein, asymmetric guest acceptor BTP-2F2Cl is designed and incorporated into a PM1:L8-BO host blend. Compared with L8-BO neat film, L8-BO:BTP-2F2Cl blend film shows higher photoluminescence quantum yield larger exciton diffusion length. Introducing extends its absorption spectrum, improves molecular packing materials, suppresses charge recombination OSCs. Consequently, power conversion improved up 19.17% (certified value 18.7%), represents highest reported single-junction OSCs so far. results show that improving behaviors promising reducing realizing high-performance

Language: Английский

---

19.7% efficiency binary organic solar cells achieved by selective core fluorination of nonfullerene electron acceptors

Joule, Journal Year: 2024, Volume and Issue: 8(3), P. 835 - 851

Published: Jan. 30, 2024

Language: Английский

---

Organic Solar Cells with Over 19% Efficiency Enabled by a 2D‐Conjugated Non‐Fullerene Acceptor Featuring Favorable Electronic and Aggregation Structures

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(32)

Published: May 27, 2023

The π-expansion of non-fullerene acceptors is a promising method for boosting the organic photovoltaic performance by allowing fine-tuning electronic structures and molecular packing. In this work, highly efficient solar cells (OSCs) are fabricated using 2D strategy to design new acceptors. Compared with quinoxaline-fused cores AQx-16, π-expanded phenazine-fused AQx-18 induce more ordered compact packing between adjacent molecules, affording an optimized morphology rational phase separation in blend film. This facilitates exciton dissociation inhibited charge recombination. Consequently, power conversion efficiency (PCE) 18.2% simultaneously increasing Voc , Jsc fill factor achieved AQx-18-based binary OSCs. Significantly, ternary devices via two-in-one alloy acceptor exhibit superior PCE 19.1%, one highest values ever reported OSCs, along high 0.928 V. These results indicate importance delicate regulation crystalline behaviors achieve performance, aimed at significantly promoting further development

Language: Английский

---

Device Performance of Emerging Photovoltaic Materials (Version 3)

Advanced Energy Materials, Journal Year: 2022, Volume and Issue: 13(1)

Published: Dec. 9, 2022

Abstract Following the 2nd release of “Emerging PV reports,” best achievements in performance emerging photovoltaic devices diverse research subjects are summarized, as reported peer‐reviewed articles academic journals since August 2021. Updated graphs, tables, and analyses provided with several parameters, e.g., power conversion efficiency, open‐circuit voltage, short‐circuit current density, fill factor, light utilization stability test energy yield. These parameters presented a function bandgap average visible transmittance for each technology application, put into perspective using, detailed balance efficiency limit. The 3rd installment reports” extends scope toward triple junction solar cells.

Language: Английский

---

Benzotriazole‐Based 3D Four‐Arm Small Molecules Enable 19.1 % Efficiency for PM6 : Y6‐Based Ternary Organic Solar Cells

Angewandte Chemie International Edition, Journal Year: 2023, Volume and Issue: 62(39)

Published: Aug. 11, 2023

A third component featuring a planar backbone structure similar to the binary host molecule has been preferred ingredient for improving photovoltaic performance of ternary organic solar cells (OSCs). In this work, we explored new avenue that introduces 3D-structured molecules as guest acceptors. Spirobifluorene (SF) is chosen core combine with three different terminal-modified (rhodanine, thiazolidinedione, and dicyano-substituted rhodanine) benzotriazole (BTA) units, affording four-arm molecules, SF-BTA1, SF-BTA2, SF-BTA3, respectively. After adding these materials classical system PM6 : Y6, resulting devices obtained ultra-high power-conversion efficiencies (PCEs) 19.1 %, 18.7 18.8 respectively, compared OSCs (PCE=17.4 %). SF-BTA1-3 can work energy donors increase charge generation via transfer. addition, transfer between also acts enhance generation. Introducing could form acceptor alloys modify molecular level inhibit self-aggregation thereby reducing loss balancing transport. Our success in 3D multi-arm shows good universality brings perspective. The further functional development make more stable efficient.

Language: Английский

---

Controlling Morphology and Voltage Loss with Ternary Strategy Triggers Efficient All-Small-Molecule Organic Solar Cells

ACS Energy Letters, Journal Year: 2023, Volume and Issue: 8(2), P. 1058 - 1067

Published: Jan. 23, 2023

Herein, an emerging acceptor L8-BO as the third component was combined with B1:BO-4Cl system for constructing efficient ternary all-small-molecule organic solar cells (ASM-OSCs). Theoretical, morphological, and crystallographic studies reveal that BO-4Cl possess good compatibility, resulting in alloy-like state formation of two acceptors blends. The synergistic effect is conducive to forming favorable phase separation molecular stacking promoting charge splitting extraction, which contributes simultaneously boosting short-circuit current density fill factor. Furthermore, higher lowest unoccupied orbital energy level assist ASM-OSCs achieving lower voltage loss respect binary devices. optimal 20 wt % deliver a top-level efficiency 17.10%. This work demonstrates not only morphology but also small matrix can be well-manipulated by employing strategy.

Language: Английский

---

Recent Developments of Polymer Solar Cells with Photovoltaic Performance over 17%

Advanced Functional Materials, Journal Year: 2023, Volume and Issue: 33(14)

Published: Jan. 22, 2023

Abstract With the emergence of ADA'DA‐type (Y‐series) non‐fullerene acceptors (NFAs), power conversion efficiencies (PCEs) organic photovoltaic devices have been constantly refreshed and gradually reached 20% in recent years (19% for single junction tandem device). The possess specific design concept, which greatly enrich NFA types excellent compatibility with many donor materials. It is gratifying to note that previously underperforming materials combine these regulated shine again. Nowadays, concept modular widely used research donors, injecting new vitality into field photovoltaics. Furthermore, also promote multicomponent devices, bilayer processing solvent engineering, additive engineering. Herein, latest progresses polymer solar cells efficiency over 17% are briefly reviewed from aspects active material design, interface development, device technology. At last, opportunities challenges commercialization future discussed.

Language: Английский

---

Non‐halogenated Solvent‐Processed Organic Solar Cells with Approaching 20 % Efficiency and Improved Photostability

Angewandte Chemie International Edition, Journal Year: 2024, Volume and Issue: 63(22)

Published: March 25, 2024

The development of high-efficiency organic solar cells (OSCs) processed from non-halogenated solvents is crucially important for their scale-up industry production. However, owing to the difficulty regulating molecular aggregation, there a huge efficiency gap between and halogenated solvent OSCs. Herein, we fabricate o-xylene OSCs with approaching 20 % by incorporating trimeric guest acceptor named Tri-V into PM6:L8-BO-X host blend. incorporation effectively restricts excessive aggregation L8-BO-X, regulates packing optimizes phase-separation morphology, which leads mitigated trap density states, reduced energy loss suppressed charge recombination. Consequently, PM6:L8-BO-X:Tri-V-based device achieves an 19.82 %, representing highest solvent-processed reported date. Noticeably, addition Tri-V, ternary shows improved photostability than binary PM6:L8-BO-X-based device, maintains 80 initial after continuous illumination 1380 h. This work provides feasible approach fabricating high-efficiency, stable, eco-friendly OSCs, sheds new light on large-scale industrial production

Language: Английский

---

Terpolymerization and Regioisomerization Strategy to Construct Efficient Terpolymer Donors Enabling High‐Performance Organic Solar Cells

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(30)

Published: April 19, 2023

Terpolymerization and regioisomerization strategies are combined to develop novel polymer donors overcome the difficulty of improving organic solar cells (OSCs) performance. Two isomeric units, bis(2-hexyldecyl)-2,5-bis(4-chlorothiophen-2-yl)thieno[3,2-b]thiophene-3,6-dicarboxylate (TTO) bis(2-hexyldecyl) 2,5-bis(3-chlorothiophen-2-yl)thieno[3,2-b]thiophene-3,6-dicarboxylate (TTI), obtained incorporated into PM6 backbone via random copolymerization form a series terpolymers. Interestingly, it is found that different chlorine (Cl) substituent positions can significantly change molecular planarity electrostatic potential (ESP) owing steric hindrance effect heavy Cl atom, which leads aggregation behaviors miscibility between donor acceptor. The TTO unit features higher number multiple S···O non-covalent interactions, more positive ESP, fewer isomer structures than TTI. As result, terpolymer PM6-TTO-10 exhibits much better coplanarity, stronger crystallinity, obvious behavior, proper phase separation in blend film, conducive efficient exciton dissociation charge transfer. Consequently, PM6-TTO-10:BTP-eC9-based OSCs achieve champion power conversion efficiency 18.37% with an outstanding fill factor 79.97%, among highest values reported for terpolymer-based OSCs. This work demonstrates terpolymerization approach achieving high-performance donors.

Language: Английский

---

Over 18% Efficiency of All‐Polymer Solar Cells with Long‐Term Stability Enabled by Y6 as a Solid Additive

Advanced Materials, Journal Year: 2023, Volume and Issue: 35(28)

Published: April 6, 2023

Morphology control greatly influences the power conversion efficiency (PCE) and long-term stability of all-polymer solar cells (all-PSCs); however, it remains challenging owing to their complex crystallization behavior. Herein, a small amount Y6 (2 wt%) is introduced as solid additive into PM6:PY-DT blend. remained inside active layer interacted with PY-DT form well-mixed phase. Increased molecular packing, enlarged phase separation size, decreased trap density are observed for Y6-processed The corresponding devices showed simultaneously improved short-circuit current fill factor, achieving high PCE over 18% excellent stability, T80 lifetime 1180 h an extrapolated T70 9185 at maximum point tracking (MPP) conditions under continuous one-sun illumination. This Y6-assisted strategy successfully applied other blends, demonstrating its universality all-PSCs. work paves new way fabrication all-PSCs superior stability.

Language: Английский

---