Journal
NANO LETTERS
Volume 15, Issue 1, Pages 354-358Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl503650a
Keywords
Singlet fission; TIPS-pentacene; colloidal nanocrystals; hybrid photovoltaics; multiple carrier generation; quantum dots
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Funding
- Singapore Agency of Science, Technology and Research (A*STAR)
- Gates Cambridge Trust
- Winton Programme for Sustainability
- EPSRC
- German National Academic Foundation (Studienstiftung)
- German Research Foundation [BR 4869/1-1]
- Selwyn College Cambridge
- KACST
- EPSRC [EP/G060738/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1362124, EP/G060738/1, 1208395] Funding Source: researchfish
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We demonstrate the successful incorporation of a solution-processable singlet fission material, 6,13-bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene), into photovoltaic devices. TIPS-pentacene rapidly converts high-energy singlet excitons into pairs of triplet excitons via singlet fission, potentially doubling the photocurrent from high-energy photons. Low-energy photons are captured by small-bandgap electron-accepting lead chalcogenide nanocrystals. This is the first solution-processable singlet fission system that performs with substantial efficiency with maximum power conversion efficiencies exceeding 4.8%, and external quantum efficiencies of up to 60% in the TIPS-pentacene absorption range. With PbSe nanocrystal of suitable bandgap, its internal quantum efficiency reaches 170 +/- 30%.
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