Synthesizing alkynyl-decorated 2D conjugated nonfullerene acceptors for efficient polymer solar cells

Liu, Zhongfei; Liu, Wanru; Su, Dan; Shen, Fang; Huo, Shuying; Han, Min−Koo; Xu, Aiguo; Chen, Zhan

doi:10.1039/d0qm00882f

Cited by 2 publications

(3 citation statements)

References 69 publications

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“…Replacing fluorine atoms in the end group by chlorine (9-40, ISI-4Cl) does not improve the PCE (12.1%). 549 Wang et al studied the NFA 9-41 (FNIC2), bearing a hexylthiophene substituent at the central benzene unit and its isomer 9-42 (FNIC1) with the structure T-Cp-T-T-B-T-T-Cp-T. 550 9-41 exhibits a lower band gap of 1.38 eV and a higher electron mobility (1.7 × 10 −3 cm 2 V −1 s −1 ) compared to 9-42 (1.48 eV, 1.2 × 10 −3 cm 2 V −1 s −1 ). While consequently the V OC of PTB7-Th/9-41-based solar cells is 30 mV lower, the J SC is increased from 20.0 to 23.9 mA cm −2 .…”

Section: Eight Fused Aromatic Ring Systemsmentioning

confidence: 99%

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Recent Progress in the Design of Fused-Ring Non-Fullerene Acceptors─Relations between Molecular Structure and Optical, Electronic, and Photovoltaic Properties

Schweda

Reinfelds

Hofstadler

et al. 2021

ACS Appl. Energy Mater.

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Organic solar cells are on the dawn of the next era. The change of focus toward non-fullerene acceptors has introduced an enormous amount of organic n-type materials and has drastically increased the power conversion efficiencies of organic photovoltaics, now exceeding 18%, a value that was believed to be unreachable some years ago. In this Review, we summarize the recent progress in the design of ladder-type fused-ring non-fullerene acceptors in the years 2018–2020. We thereby concentrate on single layer heterojunction solar cells and omit tandem architectures as well as ternary solar cells. By analyzing more than 700 structures, we highlight the basic design principles and their influence on the optical and electrical structure of the acceptor molecules and review their photovoltaic performance obtained so far. This Review should give an extensive overview of the plenitude of acceptor motifs but will also help to understand which structures and strategies are beneficial for designing materials for highly efficient non-fullerene organic solar cells.

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Section: Eight Fused Aromatic Ring Systemsmentioning

confidence: 99%

“…Thus, devices with PM6 have increased V OC values and due to a higher electron mobility also slightly higher J SC values, leading to overall improved PCEs of 13.0% ( 9-38 ) and 12.5% ( 9-39 ). Replacing fluorine atoms in the end group by chlorine ( 9-40 , ISI-4Cl) does not improve the PCE (12.1%) . Wang et al.…”

Section: Nine Fused Aromatic Ring Systemsmentioning

confidence: 99%

Recent Progress in the Design of Fused-Ring Non-Fullerene Acceptors─Relations between Molecular Structure and Optical, Electronic, and Photovoltaic Properties

Schweda

Reinfelds

Hofstadler

et al. 2021

ACS Appl. Energy Mater.

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“…On the other side, it is known that introducing conjugated side units into benzo[1,2‐ b :4,5‐ b ′]dithiophene (BDT) and their derivatives have been widely used in the design of efficient D−A copolymers and it is a valid method to tune the device parameters well and achieve high performance of OSCs [68–76] . For example, introducing fluorine or chlorine substituents into the conjugated thiophene side chains has been proven to be an effective strategy for achieving excellent PCE with high V oc owing to the relatively lower HOMO energy level in comparison with non‐halogenated thiophene side chains counterparts [77–84] .…”

Section: Introductionmentioning

confidence: 99%

Two‐Dimensional Conjugated Benzo[1,2‐b:4,5‐b′]diselenophene‐Based Copolymer Donor Enables Large Open‐Circuit Voltage and High Efficiency in Selenophene‐based Organic Solar Cells

et al. 2021

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A two‐dimensional electron‐rich fused‐ring moiety (ClBDSe) based on benzo[1,2‐b:4,5‐b′]diselenophene is synthesized. Three copolymers (PBDT−Se, PBDSe−T, and PBDSe−Se) are obtained by manipulating the connection types and number of selenophene units on the conjugated main chains with two 2D fused‐ring units and two different π‐bridges, respectively. In comparison with PBDT−Se and PBDSe−Se, PBDSe−T with benzo[1,2‐b:4,5‐b′]diselenophene unit and thiophene π‐bridge exhibits the deepest HOMO energy level and the strongest crystallinity in neat films. The PBDSe−T:Y6 blend film exhibits the best absorption complementarity, the most distinctive face‐on orientation with proper phase separation, the highest carrier mobilities, and the lowest charge recombination among three blend films. Finally, the PBDSe−T:Y6‐based device delivers an impressive power conversion efficiency (PCE) of 14.50 %, which is higher than those of PBDT−Se:Y6 and PBDSe−Se:Y6. Moreover, a decent open‐circuit voltage (Voc) of 0.89 V with a remarkably small energy loss of 0.44 eV is achieved for PBDSe−T:Y6. The efficiency of 14.50 % is the highest value for selenophene‐containing copolymer‐based binary organic solar cells (OSCs). This study provides evidence that introduction of 2D‐benzo[1,2‐b:4,5‐b′]diselenophene as a fused electron‐rich unit with π‐bridging into copolymeric donors is a valid strategy for providing high Voc and excellent PCE simultaneously in selenophene‐based OSCs.

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Synthesizing alkynyl-decorated 2D conjugated nonfullerene acceptors for efficient polymer solar cells

Abstract: Two 2D conjugated nonfullerene acceptors featured the conjugation of π-electrons of ethynyl side-chain and backbone, leading to enhanced absorptivity and downshifted energy levels, and showed around 16% efficiencies when employed as acceptor guests.

Cited by 2 publications

References 69 publications

Recent Progress in the Design of Fused-Ring Non-Fullerene Acceptors─Relations between Molecular Structure and Optical, Electronic, and Photovoltaic Properties

Recent Progress in the Design of Fused-Ring Non-Fullerene Acceptors─Relations between Molecular Structure and Optical, Electronic, and Photovoltaic Properties

Two‐Dimensional Conjugated Benzo[1,2‐b:4,5‐b′]diselenophene‐Based Copolymer Donor Enables Large Open‐Circuit Voltage and High Efficiency in Selenophene‐based Organic Solar Cells

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