Journal
NANOSCALE
Volume 6, Issue 17, Pages 10018-10026Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr01679c
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Funding
- Fundacio Privada Cellex, Barcelona
- European Commission [PIRG06-GA-2009-256355, PIEF-GA-2011-298596, N4E GA.248855]
- European Community [308997]
- Benchmark Stanford Graduate Fellowship
- Strategic International Cooperative Program, Japan Science and Technology Agency (JST)
- MICINN
- EPSRC [EP/J021199/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J021199/1] Funding Source: researchfish
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In this study, we employ a thiol-functionalized polymer (P3HT-SH) as a leverage to tailor the nanomorphology and electronic coupling in polymer-nanocrystal composites for hybrid solar cells. The presence of the thiol functional group allows for a highly crystalline semiconducting polymer film at low thiol content and allows for improved nanomorphologies in hybrid organic-inorganic systems when employing non-toxic bismuth sulfide nanocrystals. The exciton dissociation efficiency and carrier dynamics at this hybrid heterojunction are investigated through photoluminescence quenching and transient absorption spectroscopy measurements, revealing a larger degree of polaron formation when P3HT-SH is employed, suggesting an increased electronic interaction between the metal chalcogenide nanocrystals and the thiol-functionalized P3HT. The fabricated photovoltaic devices show 15% higher power conversion efficiencies as a result of the improved nanomorphology and better charge transfer mechanism together with the higher open circuit voltages arising from the deeper energy levels of P3HT-SH.
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