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Enhanced Performance and Stability in DNA-Perovskite Heterostructure-Based Solar Cells
journal contribution
posted on 2019-10-15, 13:45 authored by Yuchen Hou, Kai Wang, Dong Yang, Yuanyuan Jiang, Neela Yennawar, Ke Wang, Mohan Sanghadasa, Congcong Wu, Shashank PriyaDeoxyribonucleic
acid (DNA) has been recently recognized as hole
transport material apart from its well-known generic role. The promising
long-range hole transport capability in DNA make it potential “molecular
wire” in optoelectronics. Here, we demonstrate a core–shell
heterostructure of perovskite wrapped by cetyltrimethylammonium chloride
modified DNA (DNA-CTMA) through a self-assembly process. Such a design
results in enhanced extraction and transport of holes in the bio-photovoltaic
device and boosts the efficiency to 20.63%. The hydrophobicity of
the DNA-CTMA shell surrounding the perovskite grain boundary is also
found to enhance the device stability, as the corresponding cell retained
over 90% of initial efficiency after long-term ambient exposure. Building
upon the hole transport characteristics of DNA-CTMA, a hole-free device
is fabricated that exhibits high power conversion efficiency but has
50 000% reduced cost. These results not only demonstrate breakthrough
in designing cheap, efficient, and stable bio-photovoltaics but also
open the pathway towards the exciting possibility of controlled interaction
between living and artificial semiconductors.
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hole-free devicehole transport characteristicsdesign resultsDNA-Perovskite Heterostructure-Based Solar Cells Deoxyribonucleic acidcetyltrimethylammonium chlorideself-assembly processperovskite grain boundaryambient exposurebio-photovoltaic devicehole transport materialpower conversion efficiencyhole transport capabilitydevice stabilityEnhanced PerformanceDNA-CTMA shell
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