Journal
NANO LETTERS
Volume 12, Issue 2, Pages 1053-1057Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl204297u
Keywords
Singlet fission; pentacene; lead sulfide; colloidal quantum dot photovoltaics; multiple carrier generation
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Funding
- EPSRC SUPERGEN Excitonic Solar Cells Consortium
- Cambridge Commonwealth Trust
- Corpus Christi College
- Engineering and Physical Sciences Research Council
- Engineering and Physical Sciences Research Council [EP/G031088/1] Funding Source: researchfish
- EPSRC [EP/G031088/1] Funding Source: UKRI
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We demonstrate an organic/inorganic hybrid photovoltaic device architecture that uses singlet exciton fission to permit the collection of two electrons per absorbed high-energy photon while simultaneously harvesting low-energy photons. In this solar cell, infrared photons are absorbed using lead sulfide (PbS) nanocrystals. Visible photons are absorbed in pentacene to create singlet excitons, which undergo rapid exciton fission to produce pairs of triplets. Crucially, we identify that these triplet excitons can be ionized at an organic/inorganic heterointerface. We report internal quantum efficiencies exceeding 50% and power conversion efficiencies approaching 1%. These findings suggest an alternative route to circumvent the Shockley-Queisser limit on the power conversion efficiency of single-junction solar cells.
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