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Surface-concentrated light and efficient carrier collection in microhole-patterned Si solar cells.
Kim, Joondong,Lee, Eunsongyi,Ju, Minkyu,Kim, Hyunyub,Yi, Junsin,Moon, Sang-Jin,Hyun, Moon Seop,Kim, Dong-Wook Optical Society of America 2013 Optics express Vol.21 No.4
<P>We investigate photovoltaic characteristics of crystalline Si solar cells with microhole-patterned surface. We compare patterned samples with different hole-widths and periods with a planar counterpart. From the finite-difference time-domain simulation, the patterned and planar samples are expected to have similar short circuit current density, J(sc) (difference: 1.2%). In contrast, the difference in the measured J(sc) is as large as 12.6%. The simulated optical field patterns reveal that the sample with more significantly concentrated light near the surface has higher quantum efficiency due to more efficient carrier collection. We report the highest efficiency of 15.6% among the hole-patterned solar cells.</P>
Hybrid Structures of ITO-Nanowire-Embedded ITO Film for the Enhanced Si Photodetectors
Kim, Hyunki,Lee, Gyeong-Nam,Kim, Joondong Hindawi Limited 2018 Journal of nanomaterials Vol.2018 No.-
<P>A high-performance silicon UV photodetector was achieved by using a hybrid of a film with nanowires. Electrically conductive and optically transparent indium-tin oxide (ITO) was deposited to form an ITO film or ITO nanowire (NW) on a Si substrate, resulting in a heterojunction. The ITO-film device is stable with a low-leakage current. Meanwhile, the ITO NWs demonstrated an excellent capability to collect photogenerated carriers. The hybrid ITO (NWs on a film)/Si photodetector demonstrates a fast UV reactive time of 1.6 ms among Si-based photodetectors. We may find a means of enhancing the photoelectric performance capabilities of devices beyond the limits of conventional Si via the adoption of functional designs. Moreover, the use of a homogeneous material for the structuring of films and nanowires would offer a remarkable advantage by reducing both the number of fabrication steps and the cost.</P>