Effects of processing additives in non-fullerene organic bulk heterojunction solar cells with efficiency >11%
| Autor: | Huiqiong Zhou, Yuan Zhang, Jianqiu Wang, Defeng Zhou, Shenkun Xie, Rong Wang, Dongyang Zhang |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Fullerene Organic solar cell Photovoltaic system Energy conversion efficiency 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Acceptor Polymer solar cell Dissociation (chemistry) 0104 chemical sciences Chemical engineering 0210 nano-technology Recombination |
| Zdroj: | Chinese Chemical Letters. 30:217-221 |
| ISSN: | 1001-8417 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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