Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 7, Issue 45, Pages 25227-25236Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b07026
Keywords
inorganic-organic hybrid; layered perovskite; room-temperature exciton; exciton photocurrent; photodetector
Funding
- EPSRC [EP/K028510/1, EP/G060649/1, EP/G037221/1, EP/H007024/1, EP/L027151/1, EP/L015978/1]
- Cambridge NanoDTC
- ERC LINASS [320503]
- Engineering and Physical Sciences Research Council [EP/K028510/1, EP/G060649/1, 1108045, EP/H007024/1, EP/L027151/1] Funding Source: researchfish
- EPSRC [EP/G060649/1, EP/L027151/1, EP/H007024/1, EP/K028510/1] Funding Source: UKRI
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Room-temperature photocurrent measurements in two-dimensional (2D) inorganicorganic perovskite devices reveal that excitons strongly contribute to the photocurrents despite possessing binding energies over 10 times larger than the thermal energies. The p-type (C6H9C2H4NH3)(2)PbI4 liberates photocarriers at metallic Schottky aluminum contacts, but incorporating electron- and hole-transport layers enhances the extracted photocurrents by 100-fold. A further 10-fold gain is found when TiO2 nanoparticles are directly integrated into the perovskite layers, although the 2D exciton semiconducting layers are not significantly disrupted. These results show that strong excitonic materials may be useful as photovoltaic materials despite high exciton binding energies and suggest mechanisms to better understand the photovoltaic properties of the related three-dimensional perovskites.
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