Achieving 17.5% efficiency for polymer solar cells via a donor and acceptor layered optimization strategy
- Authors
- Xu, Wenjing; Li, Xiong; Jeong, Sang Young; Son, Jae Hoon; Zhou, Zhengji; Jiang, Qiuju; Woo, Han Young; Wu, Qinghe; Zhu, Xixiang; Ma, Xiaoling; Zhang, Fujun
- Issue Date
- 7-4월-2022
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY C, v.10, no.14, pp.5489 - 5496
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY C
- Volume
- 10
- Number
- 14
- Start Page
- 5489
- End Page
- 5496
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/140404
- DOI
- 10.1039/d2tc00024e
- ISSN
- 2050-7526
- Abstract
- Layer-by-layer polymer solar cells (LbL-PSCs) were prepared with PNTB6-Cl as the donor and Y6 as the acceptor by a sequential spin-coating method. Two solvent additives DPE and DFB were individually incorporated into PNTB6-Cl chlorobenzene solution and Y6 chloroform solution. A PCE of 17.53% was achieved for the optimal LbL-PSCs with two solvent additives, which is much larger than the PCE of 16.38% for the LbL-PSCs without solvent additives. Over 7% PCE enhancement can be realized by individually employing solvent additives in donor and acceptor layers, resulting from the simultaneously enhanced open circuit voltage (V-OC) of 0.88 V, short circuit current density (J(SC)) of 26.63 mA cm(-2) and fill factor (FF) of 74.83%. The photogenerated exciton distribution, charge transport and collection in the LbL-PSCs can be optimized by employing different solvent additives in donor and acceptor solutions. Meanwhile, the efficient energy transfer from PNTB6-Cl to Y6 can provide an additional channel for improving the exciton utilization efficiency through exciton dissociation at PNTB6-Cl/Y6 interfaces. Meanwhile, the PCEs of LbL-PSCs are better than those of bulk heterojunction PSCs with the same materials and solvent additives, indicating the great potential of LbL-PSCs for commercial application.
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