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Versatile Sequential Casting Processing for Highly Efficient and Stable Binary Organic Photovoltaics.

Chengliang He¹, Youwen Pan¹, Guanghao Lu²

¹State Key Laboratory of Silicon Materials, MOE Key Laboratory of Macromolecular Synthesis and Functionalization, International Research Center for X Polymers, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, P. R. China.

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Summary

This summary is machine-generated.

Sequential casting (SC) improves organic solar cell (OSC) performance by optimizing bulk heterojunction (BHJ) morphology. This method achieved a record 18.86% power conversion efficiency (PCE) in binary OSCs.

Keywords:

binary devices bulk-heterojunctions organic solar cells phase-separation sequential casting

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Area of Science:

Materials Science
Organic Electronics
Photovoltaics

Background:

Bulk heterojunction (BHJ) morphology is crucial for efficient photon-to-electron conversion in organic solar cells (OSCs).
The blend casting (BC) method is widely used, but alternative techniques may offer advantages.

Purpose of the Study:

To investigate the efficacy of sequential casting (SC) for constructing BHJ morphology in OSCs.
To compare SC with the traditional BC method across different donor:acceptor (D:A) blends.
To elucidate the morphology evolution and its impact on device performance.

Main Methods:

Utilized blend casting (BC) and sequential casting (SC) methods.
Employed three representative D:A blends: PM6:PC71BM, PM6:IT-4F, and PM6:L8-BO.
Analyzed phase separation, vertical distribution, and D:A ratio-dependent properties.

Main Results:

Sequential casting (SC) consistently yielded higher power conversion efficiencies (PCEs) compared to BC across all tested blends.
A champion PCE of 18.86% (certified 18.44%) was achieved with the PM6:L8-BO blend using SC, a record for binary OSCs.
SC processing led to improved vertical phase segregation, enhancing charge transport and collection, and demonstrated better photostability and scalability.

Conclusions:

Sequential casting (SC) is a versatile and effective method for fabricating high-performance organic solar cells (OSCs).
The proposed swelling-intercalation phase-separation model explains morphology development during SC.
SC offers advantages in device performance, stability, and fabrication scalability for BHJ-based OSCs.