Significantly Enhanced Molecular Stacking in Ternary Bulk Heterojunctions Enabled by an Appropriate Side Group on Donor Polymer

Jiang, Huanxiang; Li, Xiaoming; Wang, Huan; Ren, Z.F.; Zheng, Nan; Wang, Xunchang; Li, Yonghai; Chen, Weichao; Yang, Renqiang

doi:10.1002/advs.201903455

Cited by 33 publications

(20 citation statements)

References 63 publications

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“…These advantages are conducive to the record of such high FFs of over 80% in IDIC-C5Ph-based optimal devices. 43 , 44 …”

Section: Resultsmentioning

confidence: 99%

Subtle Side Chain Triggers Unexpected Two-Channel Charge Transport Property Enabling 80% Fill Factors and Efficient Thick-Film Organic Photovoltaics

Chen

et al. 2021

The Innovation

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To clearly show how important the impact of side chains on organic solar cells (OSCs) is, we designed three acceptors IDIC-C x Ph ( x = 4, 5, or 6) via subtle side-chain regulation. Despite this small change, significant distinctions were detected. IDIC-C4Ph devices achieve an optimal efficiency of 13.94% under thermal annealing, but thermal-assistant solvent-vapor annealing hugely suppresses the efficiencies to 10%. However, the C6Ph side chain endows extremely disordered stacking orientations, generating moderate efficiencies of ~12.50%. Excitingly, the IDIC-C5Ph affords an unexpected two-channel π-π charge transport (TCCT) property, boosting the fill factor (FF) by up to 80.02% and efficiency to 14.56%, ranking the best among five-ring fused-ladder-type acceptors. Impressively, the special TCCT behavior of IDIC-C5Ph enables 470 nm thick-film OSC with a high FF of up to 70.12% and efficiency of 13.01%, demonstrating the great promise in fabricating large-scale OSCs.

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“…These advantages are conducive to the record of such high FFs of over 80% in IDIC-C5Ph-based optimal devices. 43 , 44 …”

Section: Resultsmentioning

confidence: 99%

Subtle Side Chain Triggers Unexpected Two-Channel Charge Transport Property Enabling 80% Fill Factors and Efficient Thick-Film Organic Photovoltaics

Chen

et al. 2021

The Innovation

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“…Organic solar cells (OSCs) have witnessed an impressive revival owing to the rapid development of acceptor-donoracceptor (A-D-A) small molecular acceptors (SMAs). [1][2][3][4][5] The efficiency of 18.32%. [11] Besides, traditional side chains consist of phenyl and alkyl side groups, which often induce undesirable trade-off between aggregation of SMAs and miscibility of active layers.…”

Section: Introductionmentioning

confidence: 99%

Balancing Intermolecular Interactions between Acceptors and Donor/Acceptor for Efficient Organic Photovoltaics

Han

Wang

Chen

et al. 2021

Adv Funct Materials

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Promoted by uninterrupted materials and device innovation, organic solar cells have achieved impressive development. However, the complicated intermolecular interactions inside active layers are less understood. Herein, the intermolecular interactions are studied from the dual perspectives of acceptor/acceptor (A/A) and donor/acceptor (D/A), and how these interactions synergistically control the final efficiencies. Three small molecular acceptors (SMAs) are designed with different end-caps, which manipulate the crystallinity and electrostatic potential (ESP) distributions of acceptors, and accordingly, the A/A and D/A intermolecular interactions. The results show that SMA LA17 with low A/A interactions exhibits inferior performance around 12%, owing to its strong D/A interaction with donor PM6, which shapes too miscible morphology and increases charge recombination. Instead, LA16 with strong A/A interactions and moderate D/A interactions delivers improved bulk-heterojunction (BHJ) networks, and therefore, enhances charge transport and diminishes geminate or trap-assisted charge recombination. Consequently, PM6:LA16 records the competitive efficiency of up to 13.74% among the three systems. Therefore, this study deepens the synergistic or balancing effect of the D/A and A/A interactions on BHJ blends for efficient organic solar cells.

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“…Organic solar cells (OSCs) have aroused much attention owing to its natural flexibility, low-weight, and wide material sources. [1][2][3] Developing high performance OSCs is a prerequisite to efficiently harvest solar energy and generate clean energy, especially in the emerged portable flexible optoelectronics. Thanks to the development of non-fullerene acceptors, the power conversion efficiencies (PCEs) have been markedly boosted to 17% from Y6 and its derivatives based bulk-heterojunction (BHJ) devices.…”

Section: Introductionmentioning

confidence: 99%

Rational Mutual Interactions in Ternary Systems Enable High‐Performance Organic Solar Cells

Jiang

Han

et al. 2020

Adv Funct Materials

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Ternary organic solar cells (TOSCs) offer a facile and efficient approach to increase the power conversion efficiencies (PCEs). However, the critical roles that guest components play in complicated ternary systems remain poorly understood. Herein, two acceptors named LA1 and LA9 with differing crystallinity are investigated. The overly crystalline LA9 induces large self-aggregates in PM6:LA9 binary system, resulting in a lower PCE (13.12%) compared to PM6:LA1 device (13.89%). Encouragingly, both acceptors are verified as efficient guest candidates into the host binary PM6:NCBDT-4Cl (PCE = 13.48%) and afford markedly improved PCEs up to 15.39% and 15.75% in LA1 and LA9 ternary devices, respectively. Interestingly, the higher crystallinity LA9 reveals smaller interaction energies with both the host acceptor and donor PM6. Compared to LA1, the appropriate mutual interactions in the LA9 ternary system not only induces the orderly crystallinity of PM6 but also better compatibility with the host acceptor, generating further optimized molecular orientations and ternary morphology. Therefore, enhanced charge transport and minimized recombination loss are detected in LA9 ternary devices, affording the most competitive performance among Y6-sbsent TOSCs. This work suggests that complicated intermolecular interactions should be seriously considered when fabricating state-of-the-art multiple components OSCs.

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Significantly Enhanced Molecular Stacking in Ternary Bulk Heterojunctions Enabled by an Appropriate Side Group on Donor Polymer

Cited by 33 publications

References 63 publications

Subtle Side Chain Triggers Unexpected Two-Channel Charge Transport Property Enabling 80% Fill Factors and Efficient Thick-Film Organic Photovoltaics

Subtle Side Chain Triggers Unexpected Two-Channel Charge Transport Property Enabling 80% Fill Factors and Efficient Thick-Film Organic Photovoltaics

Balancing Intermolecular Interactions between Acceptors and Donor/Acceptor for Efficient Organic Photovoltaics

Rational Mutual Interactions in Ternary Systems Enable High‐Performance Organic Solar Cells

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