The Potential Game‐Changer: A Concept‐to‐Proof Study on D:A Heterojunction‐Free Organic Photovoltaics

Author:

Zuo Lijian12,Jo Sae Byeok32,Shi Xueliang42,Lin Francis5,Jen Alex15672

Affiliation:

1. State Key Laboratory of Silicon and Advanced Semiconductor Materials, MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering Zhejiang University Hangzhou Zhejiang 310058 China

2. Department of Materials Science and Engineering University of Washington Seattle WA USA

3. School of Chemical Engineering Sungkyunkwan University (SKKU) Suwon 16419 Republic of Korea

4. School of Chemistry and Molecular Engineering East China Normal University Shanghai 200062 China

5. Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong China

6. Department of Chemistry City University of Hong Kong Kowloon Hong Kong China

7. Hong Kong Institute for Clean Energy Hong Kong China

Abstract

Comprehensive SummarySince 1986, the donor‐acceptor (D:A) heterojunction has been regarded a necessity for high‐efficiency organic photovoltaics (OPVs), due to its unique advantage in compensating the intrinsic limitations of organic semiconductors, such as high exciton binding energy and poor ambipolar charge mobility. While this adversely causes tremendous non‐radiative charge recombination and instability issues, which currently become the most critical limits for commercialization of OPVs. Here, we present a concept‐to‐proof study on the potential of D:A heterojunction free OPV by taking advantage of recent progress of non‐fullerene acceptors. First, we demonstrate that the “free carriers” can be spontaneously generated upon illumination in an NFA, i.e., the 6TIC‐4F single layer. Second, the 6TIC‐4F layer also exhibits good ambipolar charge transporting property. These exceptional characteristics distinguish it from the traditional organic semiconductors, and relieve it from the reliance of D:A heterojunction to independently work as active layer. As a result, the subsequent OPV by simply sandwiching the 6TIC‐4F layer between the cathode and anode yields a considerably high power conversion efficiency ~1%. Moreover, we find the D:A heterojunction free device exhibits two order of magnitude higher electroluminescence quantum efficiency and significantly reduced VOC loss by 0.16 eV compared to those of the D:A BHJ structure, validating its promise for higher efficiency in the future. Therefore, our work demonstrates the possibility of using D:A heterojunction‐free device structure for high performance, that can potentially become the next game changer of OPV.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

General Chemistry

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