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Volume 4
Nano Research & Applications
ISSN: 2471-9838
Page 98
&
JOINT EVENT
October 04-05, 2018 Moscow, Russia
2
nd
Edition of International Conference on
26
th
International Conference on
Advanced Nanotechnology
Materials Technology and Manufacturing Innovations
Advanced Nanotechnology 2018
& Materials-Manufacturing 2018
October 04-05, 2018
Nano Res Appl 2018, Volume 4
DOI: 10.21767/2471-9838-C5-021
Air-stable high efficiency perovskite solar cells fabricated with graphene and metal oxide based
nanocomposites
Yoon-Bong Hahn
Chonbuk National University, South Korea
T
he poor air-stability and reproducibility of hybrid solar cells have prevented the practical applications of the devices
that can withstand sustained operation under ambient air conditions. To solve this issue, we developed simple
methods for the production of silver nanoparticles (AgNPs) and reduced graphene oxide (rGO) in the form of Ag-rGO
composites by one-step microwave-assisted reduction (MWAR) for bulk-heterojunction solar cells (BHJ-SCs) and the
synthesis of perovskite-metal oxide composite for perovskite solar cells (PSCs). The field-effect transistor fabricated
with the Ag-rGO composite showed p-type behavior with a high mobility of 3.3x105 cm2V-1s-1 and conductivity of
9x106 S/m which is one-order of magnitude greater than pristine graphene (1.59x105 S/m). As-synthesized Ag-rGO
composite was introduced into the active layer of bulk heterojunction solar cell based on P3HT:PCBM. Compared to
the P3HT:PCBM only device, the Ag-rGO implemented device showed 33% increase in photocurrent density and 42%
increase of power conversion efficiency (PCE) due to enhancement of the charge carrier generation and fast extraction
of holes to the electrode. By introducing the perovskite-metal oxide composite into PSCs with Al2O3/NiO interface
engineering, we obtained a high efficiency of 18.14% for a champion device and excellent reproducibility of average 16-
18% PCE for 35 devices which were all fabricated under ambient-air conditions, not in a glove box. More importantly,
the devices without encapsulation showed a significant enhancement in long-term air-stability; the device photovoltaic
parameters stabilized after 20 days and sustained its stability over 210 days with retaining ~100% of its original Voc,
~94% of Jsc, ~91% of FF and ~86% of PCE in an ambient environment.
ybhahn@chonbuk.ac.kr