Simple Non‐Fused Electron Acceptors Leading to Efficient Organic Photovoltaics

All-polymer solar cells (all-PSCs) have received attention due to their morphological stability under thermal and mechanical stresses. Currently, the highest reported power conversion efficiency of all-PSCs is over 17%, achieved by utilizing polymerized small molecular acceptors (PSMAs). However, the need for higher regiospecificity to avoid forming isomers during polymerization of SMAs still challenges the further applications of all-PSCs. From this perspec-

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“…These UF-SMAs may serve as cost-effective alternatives to replace Y6-based SMAs for PSMAs innovations in all-PSCs. [55][56][57]…”

Section: Polymer Donor Selectionsmentioning

confidence: 99%

Polymerizing small molecular acceptors for efficient all‐polymer solar cells

Kong

Yuan

et al. 2022

InfoMat

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“…[16][17][18][19] As an alternative candidate to alleviate above issues, unfused non-fullerene acceptors (UF-NFAs) have attracted broad interest recently. [19][20][21] However, the current PCEs of UF-NFAs-based PSCs [22][23][24][25][26][27][28][29] still lag behind those based on F-NFAs. Therefore, the development of efficient UF-NFAs is of great urgency.…”

Section: Introductionmentioning

confidence: 99%

“…Over the past few years, molecular design for high-performance UF-NFAs mainly focused on planarizing molecular backbone through non-covalent conformational locking, which has been proved as an effective strategy for efficient charge transport. [22][23][24][25][26][27][28][29] However, the correlation between device performance and the bulk-heterojunction active layer morphology in terms of the molecular conformations [26,27] and molecular packing patterns, [30][31][32][33][34][35][36][37][38] still remains unclear in the field of UF-NFAs. As revealed by our recent work on crystallographic analysis of highly efficient Y6 and CH1007 F-NFAs, [10] π-core interaction plays a crucial role in regulating the molecular geometry and triggering unique self-assembly that benefit photovoltaic performance.…”

Section: Introductionmentioning

confidence: 99%

Regulating the Aggregation of Unfused Non‐Fullerene Acceptors via Molecular Engineering towards Efficient Polymer Solar Cells

et al. 2021

ChemSusChem

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Tuning molecular aggregation via structure design to manipulate the film morphology still remains as a challenge for polymer solar cells based on unfused non-fullerene acceptors (UF-NFAs). Herein, a strategy was developed to modulate the aggregation patterns of UF-NFAs by systematically varying the π-bridge (D) unit and central core (A') unit in AÀ D-A'À DÀ A framework (A and D refer to electron-withdrawing and electron-donating moieties, respectively). Specifically, the quantified contents of H-or J-aggregation and crystallite disorder of three UF-NFAs (BDIC2F, BCIC2F, and TCIC2F) were analyzed via UV/Vis spectrometry and grazing incidence X-ray scattering. The results showed that the H-aggregate-dominated BCIC2F with less crystallite disorder exhibited a more favorable blend morphology with polymer donor PBDB-T (poly [(2,6-(4,8-bis(5-(2ethylhexyl)) relative the other two UF-NFAs, resulting in improved exciton dissociation and charge tranport. Consequently, photovoltaic devices based on BCIC2F delivered a promising power conversion efficiency of 12.4 % with an exceptionally high short-circuit current density of 22.1 mA cm À 2 .

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“…Although the rapid progress being made for OSCs in recent years, [1][2][3][4] with the power conversion efficiency (PCE) surpassing 18%, [5][6][7][8][9] efforts are still needed to push OSCs toward the practical relevance. 10,11 There are great demands for the development of high-performance and low-cost photovoltaic materials, [12][13][14] yet being rare. Inorganic metal oxides (MOs) can potentially be scaled up with low costs, such as zinc oxides (ZnOs), which have been employed in OSCs as electron transport layers (ETLs).…”

Section: Introductionmentioning

confidence: 99%

Healing the degradable organic–inorganic heterointerface for highly efficient and stable organic solar cells

Tao

Liu

Wang

et al. 2022

InfoMat

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The heterointerface between the contacted organic and inorganic semiconductors critically affects the charge extraction, hence overall performance of organic optoelectronics, especially for organic solar cells (OSCs). Herein, we develop an effective interfacial strategy that simultaneously boosts the chemical, electric, and electronic properties of the organic-inorganic heterointerface of the derived OSCs, through implanting conjugated molecules as selfassemble monolayers (SAMs) to metal oxide nanoparticles (MO NPs). As results, SAM passivated zinc oxide nanoparticles (ZnO NPs) as electron transport layers (ETLs) not only enable the best performed OSCs containing MO ETLs, but also exhibit the most desirable thickness insensitive features (up to 300 nm). In addition, SAM-ZnO ETLs help also substantially improving the photostability of the derived OSCs. Overall, this work can be beneficial to the further development of high-performance and cost-effective OSCs.

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Simple Non‐Fused Electron Acceptors Leading to Efficient Organic Photovoltaics

Cited by 25 publications

References 53 publications

Polymerizing small molecular acceptors for efficient all‐polymer solar cells

Polymerizing small molecular acceptors for efficient all‐polymer solar cells

Regulating the Aggregation of Unfused Non‐Fullerene Acceptors via Molecular Engineering towards Efficient Polymer Solar Cells

Healing the degradable organic–inorganic heterointerface for highly efficient and stable organic solar cells

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