Journal
NANOSCALE
Volume 11, Issue 46, Pages 22467-22474Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr08477k
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Funding
- National Key Research and Development Program of China [2017YFA0206600]
- National Natural Science Foundation of China [61674141, 51972300, 61504134, 21975245]
- Key Research Program of Frontier Science, Chinese Academy of Sciences [QYZDBSSW-SLH006]
- Hundred Talents Program (Chinese Academy of Sciences)
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Fabricating thin film solar cells on the light-trapping structures is an effective way to improve the absorption of the active layer. Here, we report a non-fullerene organic solar cell based on a PBDB-T:ITIC active layer, a wrinkled metal rear electrode, and a MoO3/Ag/ZnS front transparent electrode. Optical characterization shows that the wrinkled metal structure can remarkably increase the absorption of the active layer in a broadband range. The resulting device shows a power conversion efficiency of 8.2%, which increases by 4.6% compared to that of the flat counterpart. Apart from higher absorption, the improved performance can also be ascribed to the efficient charge transport and collection in the device due to the lower defect density, larger interfacial area, and smaller active layer thickness. A device with a power conversion efficiency of 10.19% based on the flat ITO/glass substrate is also achieved. Accordingly, a power conversion efficiency of about 10.66% is predicted under the condition where the wrinkled rear electrode and the ITO front electrode are employed. In addition, the power conversion efficiency of the wrinkled device could increase by about 50.48% compared to that of the flat device under an incident angle of 60 degrees C, illustrating that a better omnidirectional ability is achieved.
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