Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 7, Issue 10, Pages 5315-5323Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta11361k
Keywords
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Funding
- QUT
- Science and Engineering Faculty (QUT)
- Welsh Assembly Government
- EPSRC grants EPSRC Supergen SuperSolar Hub for an International and Industrial Engagement Award (Supergen Solar Challenge)
- Marie Curie COFUND fellowship
- UKRI Global Challenge Research Fund project SUNRISE [EP/P032591/1]
- Ministry of Education of Singapore
- European Union [663830]
- Queensland government via the Q-CAS funding scheme
- Australian Research Council [FT130101337]
- EPSRC [EP/P032591/1] Funding Source: UKRI
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This study reports three newly developed dopant-free hole-transporting materials (HTMs) for perovskite solar cells. The design is based on a quinacridone (QA) dye as the core with three different extended end-capping moieties, namely, acenaphthylene (ACE), triphenylamine (TPA) and diphenylamine (DPA), attached to the QA core. These HTMs were synthesized and used to successfully fabricate in mesoscopic TiO2/CH3NH3PbI3/HTM perovskite devices. Under AM 1.5G illumination at 100 mW cm(-2), the devices achieved a maximum efficiency of 18.2% for ACE-QA-ACE, 16.6% for TPA-QA-TPA and 15.5% for DPA-QA-DPA without any additives, whereas reference devices with doped spiro-OMeTAD as the HTM achieved a PCE of 15.2%. Notably, the unencapsulated devices based on the novel dopant-free HTMs exhibited impressive stability in comparison with the devices based on doped spiro-OMeTAD under a relative humidity of 75% for 30 days. These linear symmetrical HTMs pave the way to a new class of organic hole-transporting materials for cost-efficient and large-area applications of printed perovskite solar cells.
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