Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 6, Issue 34, Pages 9111-9118Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8tc02838a
Keywords
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Funding
- Research Committee of HKBU [RC-ICRS/15-16/4ASSK]
- HKBU Faculty Research Grant [FRG2/17-18/078]
- Hong Kong Research Grants Council [HKBU 22304115-ECS]
- Areas of Excellence Scheme [AoE/P-03/08]
- Hong Kong Baptist University [FRG1/15-16/052, FRG2/16-17/024]
- CityU [11212216]
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A porphyrin-based donor material P1 is used to fabricate bulk-heterojunction solar cells harvesting room light. P1 consists of a porphyrin ring linked by two ethylrhodanine end caps via phenylene ethynylene bridges. Organic photovoltaic (OPV) cells using P1 as the donor exhibit significantly improved performances under indoor illumination compared to 1 sun conditions. For P1:PC71BM cells, an optimized-PCE of 19.2% was achieved under a 300 lux illumination of a 3000 K LED tube. Besides high PCEs, the porphyrin-based devices also exhibit enhanced OPV performances in thick film regions (approximate to 200 nm) compared to a control BHJ cell using PCDTBT:PC71BM. The thick-film P1-based device shows an overall PCE of 18.2%. The origins of the thickness independent OPV performances were examined, and they can be attributed to the low electronic disorders of these materials when compared to their polymer counterparts.
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