Highly efficient and stable binary all-polymer solar cells enabled by sequential deposition processing tuned microstructures

Zhao, Chaoyue; Ma, Ruijie; Oh, Jiyeon; Wang, Lihong; Zhang, Guoping; Wang, Yajie; He, Siyi; Zhu, Lan; Yang, Changduk; Zhang, Guangye; Li, Gang

doi:10.1039/d2tc04142a

Cited by 6 publications

(3 citation statements)

References 63 publications

(65 reference statements)

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“…The vertical segregation of D18-Fu and L8-BO tuned by isomeric additives was studied using film-depth-dependent light absorption spectroscopy. [52][53][54] The results are presented in Figure 5a and the composition weight ratio of D18-Fu and L8-BO, charge-generation heat maps, and integrated curves are provided in Figure 5b-d, respectively. The w/o film exhibited an averaged vertical distribution in the medium level and somewhat L8-BO rich regions at the bottom and upper levels.…”

Section: Resultsmentioning

confidence: 99%

An Isomeric Solid Additive Enables High‐Efficiency Polymer Solar Cells Developed Using a Benzo‐Difuran‐Based Donor Polymer

Chen

et al. 2023

Advanced Materials

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Currently, nearly all high‐efficiency organic photovoltaic devices use donor polymers based on the benzo‐dithiophene (BDT) unit. To diversify the choices of building blocks for high‐performance donor polymers, the use of benzo‐difuran (BDF) units is explored, which can achieve reduced steric hindrance, stronger molecular packing, and tunable energy levels. In previous research, the performance of BDF‐based devices lagged behind those of BDT‐based devices. In this study, a high efficiency (18.4%) is achieved using a BDF‐based polymer donor, which is the highest efficiency reported for BDF donor materials to date. The high efficiency is enabled by a donor polymer (D18‐Fu) and the aid of a solid additive (2‐chloronaphthalene), which is the isomer of the commonly used additive 1‐chloronaphthalene. These results revealed the significant effect of 2‐chloronaphthalene in optimizing the morphology and enhancing the device parameters. This work not only provides a new building block that can achieve an efficiency comparable to dominant BDT units but also proposes a new solid additive that can replace the widely used 1‐chloronaphthalene additive.

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Section: Resultsmentioning

confidence: 99%

An Isomeric Solid Additive Enables High‐Efficiency Polymer Solar Cells Developed Using a Benzo‐Difuran‐Based Donor Polymer

Chen

et al. 2023

Advanced Materials

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“…Thus, we first probe the phase separation/distribution and global characteristics of films by transmission electron microscopy (TEM) technology. [ 39‐42 ] As shown in Figure 2, the initial state of the film without SVA or TA has significant aggregates and less connected nanonetwork among phases. After TA, the significant aggregates almost disappear, indicating the over‐large aggregates are obviously reduced, and the formation of well separated phases, which is supposed to be beneficial to J SC .…”

Section: Resultsmentioning

confidence: 99%

A Two‐in‐One Annealing Enables Dopant Free Block Copolymer Based Organic Solar Cells with over 16% Efficiency

et al. 2023

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The organic solar cells (OSCs) based on block copolymer systems bear the hope of achieving the optimal balance of power conversion efficiency (PCE) and stability, but the key index, PCE of this type devices is still low. To improve the efficiency, regulating the thin-film morphology is always the core engineering, which is usually achieved via two aspects: precursor optimization and post treatments. Herein, we extend our previous success in post treatments (two step annealing) to a novel two-in-one annealing tactic, which realizes limited phase separation and well-connected domain distribution. As a result, the optimal PCE as high as 16.08%, representing the cutting-edge level of block copolymer based OSCs (notably dopant free). Furthermore, a comprehensive study on all kinds of annealing methods is carried out, including TA, SVA, SVA+TA, TA+SVA and SVTA (the best one), and an in-depth understanding is demonstrated, with the help of different characterizations.

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“…However, employing alternative non-halogen solvents generally leads to a decrease in device efficiency. This is primarily attributed to the insufficient solubility of the active layer in non-halogen solvents [ 37 , 38 ]. To address these issues, the core objective of this work is to find a means to mitigate the rapid decline in efficiency with increasing active layer thickness in high-efficiency all-PSCs using non-halogen solvents.…”

Section: Introductionmentioning

confidence: 99%

All-Polymer Solar Cells Sequentially Solution Processed from Hydrocarbon Solvent with a Thick Active Layer

Wang,

Zhao,

Cai

et al. 2023

Polymers

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Organic solar cells (OSCs) have gained increasing attention. Among the various directions in OSCs, all-polymer solar cells (all-PSCs) have emerged as a highly promising and currently active research area due to their excellent film formation properties, mechanical properties, and thermal stabilities. However, most of the high-efficiency all-PSCs are processed from chloroform with an active layer thickness of ~100 nm. In order to meet the requirements for industrialization, a thicker active layer processed from low-vapor pressure solvents (preferentially a hydrocarbon solvent) is strongly desired. Herein, we employ toluene (a hydrocarbon solvent with a much higher boiling point than chloroform) and a method known as sequential processing (SqP) to mitigate the rapid decline in efficiency with increasing film thickness. We show that SqP enables a more favorable vertical phase segregation that leads to less trap-assisted recombination and enhanced charge extraction and lifetime than blend-cast devices at higher film thicknesses.

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Highly efficient and stable binary all-polymer solar cells enabled by sequential deposition processing tuned microstructures

Abstract: The power conversion efficiency (PCE) and operation stability of all-polymer solar cells (all-PSCs) are expected to be simultaneously pushed to a high level, that can be considered for further commercialization....

Cited by 6 publications

References 63 publications

An Isomeric Solid Additive Enables High‐Efficiency Polymer Solar Cells Developed Using a Benzo‐Difuran‐Based Donor Polymer

An Isomeric Solid Additive Enables High‐Efficiency Polymer Solar Cells Developed Using a Benzo‐Difuran‐Based Donor Polymer

A Two‐in‐One Annealing Enables Dopant Free Block Copolymer Based Organic Solar Cells with over 16% Efficiency

All-Polymer Solar Cells Sequentially Solution Processed from Hydrocarbon Solvent with a Thick Active Layer

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