Graphene Quantum Dot Layers with Energy-Down-Shift Effect on Crystalline-Silicon Solar Cells.
Graphene quantum dot (GQD) layers were deposited as an energy-down-shift layer on crystalline-silicon solar cell surfaces by kinetic spraying of GQD suspensions. A supersonic air jet was used to accelerate the GQDs onto the surfaces. Here, we report the coating results on a silicon substrate and the GQDs' application as an energy-down-shift layer in crystalline-silicon solar cells, which enhanced the power conversion efficiency (PCE). GQD layers deposited at nozzle scan speeds of 40, 30, 20, and 10 mm/s were evaluated after they were used to fabricate crystalline-silicon solar cells; the results indicate that GQDs play an important role in increasing the optical absorptivity of the cells. The short-circuit current density was enhanced by about 2.94% (0.9 mA/cm(2)) at 30 mm/s. Compared to a reference device without a GQD energy-down-shift layer, the PCE of p-type silicon solar cells was improved by 2.7% (0.4 percentage points).
Department of Materials Science and Engineering, Solar Energy Research Center of Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea.
Kyung D
KD
Lee
Department of Chemistry, College of Natural Sciences, Seoul National University , Daehack-dong, Gwanak-gu, Seoul 151-747, Korea.
Myung J
MJ
Park
Department of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea.
Do-Yeon
DY
Kim
Department of Materials Science and Engineering, Solar Energy Research Center of Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea.
Soo M
SM
Kim
Department of Materials Science and Engineering, Solar Energy Research Center of Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea.
Byungjun
B
Kang
Department of Materials Science and Engineering, Solar Energy Research Center of Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea.
Seongtak
S
Kim
Department of Materials Science and Engineering, Solar Energy Research Center of Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea.
Hyunho
H
Kim
Department of Materials Science and Engineering, Solar Energy Research Center of Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea.
Hae-Seok
HS
Lee
KU-KIST Green School - Graduate School of Energy and Environment, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea.
Yoonmook
Y
Kang
Department of Mechanical Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea.
Sam S
SS
Yoon
Department of Chemistry, College of Natural Sciences, Seoul National University , Daehack-dong, Gwanak-gu, Seoul 151-747, Korea.
Byung H
BH
Hong
Department of Materials Science and Engineering, Solar Energy Research Center of Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-713, Korea.
Donghwan
D
Kim
GQD layers; energy-down-shift; graphene quantum dots; light absorption; silicon solar cells