Citation: Xie Shenkun, Wang Jianqiu, Wang Rong, Zhang Dongyang, Zhou Huiqiong, Zhang Yuan, Zhou Defeng. Effects of processing additives in non-fullerene organic bulk heterojunction solar cells with efficiency >11%[J]. Chinese Chemical Letters, ;2019, 30(1): 217-221. doi: 10.1016/j.cclet.2018.04.001 shu

Effects of processing additives in non-fullerene organic bulk heterojunction solar cells with efficiency >11%

a.
School of Chemistry and Life Science, Changchun University of Technology, Changchun 130012, China
b.
HEEGER Beijing Research & Development Center, School of Chemistry, Beihang University, Beijing 100191, China
c.
CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China

Corresponding author: Zhou Huiqiong, zhouhq@nanoctr.cn Zhang Yuan, yuanzhang@buaa.edu.cn Zhou Defeng, defengzhou65@126.com
Received Date: 7 November 2017
Revised Date: 16 March 2018
Accepted Date: 2 April 2018
Available Online: 3 January 2018

Figures(4)

Here we investigate processing additive-dependent photovoltaic performance and charge recombination in organic bulk heterojunction (BHJ) solar cells based on a polymeric donor of PBDB-T blended with a non-fullerene acceptor m-ITIC. We find that PBDB-T:m-ITIC solar cells exhibit good compatibilities with the utilized additives (DIO, CN, DPE, and NMP) in optimal conditions, can have a high charge dissociation probability approaching 100% (with DIO), leading to ultimate efficiency >11%. Regardless of additives, we observe a dominant 1st order monomolecular recombination with insignificant bi-molecular recombination or space-charge effects in these solar cells. Despite of impressive power conversion efficiency (PCE), it is of surprise that Shockley-Read-Hall recombination is identified to play a role in device operation. Thus, it points to the necessity to mitigate the influences of traps to further boost the efficiency in non-fullerene based organic solar cells.
- Organic solar cell,
- Solvent additive,
- Morphology,
- Recombination,
- Non-fullerene
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沈阳化工大学材料科学与工程学院沈阳 110142