Analysis of a-Si:H/TCO contact resistance for the Si heterojunction back-contact solar cell

Seung-Yoon Lee, Hongsik Choi, Hongmei Li, +6

Solar Energy Materials and Solar Cells

Materials ScienceElectrical EngineeringEngineeringOrganic Solar CellApplied Physics +6

Ultra-compact, zero-power magnetic latching piezoelectric inchworm motor with integrated position sensor

Changhoon Oh, Junghoon Choi, Hyo‐Jin Nam, +2

Sensors and Actuators A Physical

Electrical EngineeringEnergy HarvestingEngineeringPiezoelectric NanogeneratorsMechatronics +5

Electromagnetic variable optical attenuator

Chang‐Hyeon Ji, Y. Yee, Junghoon Choi, +1

IEEE/LEOS International Conference on Optical MEMS

PhotonicsOptical Switching ApplicationsEngineeringOptical Transmission SystemMicrofabrication +9

Fabrication and characterization of a PZT actuated micromirror with two-axis rotational motion for free space optics

Youngjoo Yee, Jong Uk Bu, Man-Hyo Ha, +4

PhotonicsActuated MicromirrorOptical MaterialsFree Space OpticsEngineering +13

Annealing effect on surface passivation of a-Si:H/c-Si interface in terms of crystalline volume fraction

Hyun Jin Yang, Kwang‐Sun Ji, Junghoon Choi, +1

Current Applied Physics

Materials ScienceCrystalline Volume FractionEngineeringNanoelectronicsSurface Science +8

A study of crystallinity in amorphous Si thin films for silicon heterojunction solar cells

Kwang Sun Ji, Junghoon Choi, Hyun Jin Yang, +2

Solar Energy Materials and Solar Cells

Materials ScienceEngineeringSilicon On InsulatorApplied PhysicsSemiconductor Material +5

The Emitter Having Microcrystalline Surface in Silicon Heterojunction Interdigitated Back Contact Solar Cells

Kwang-sun Ji, Hojung Syn, Junghoon Choi, +2

Japanese Journal of Applied Physics

EngineeringEmitter CaseSemiconductor MaterialsAmorphous Si EmitterPhotovoltaic Devices +17

Tracking system and MPPT control for efficiency improvement of photovoltaic

Jung-Sik Choi, Do-Yeon Kim, Ki‐Tae Park, +2

EngineeringEnergy EfficiencyEnergy ConversionPhotovoltaic SystemPhotovoltaic Power Station +15

Integrated micro optical flying head with lens positioning actuator for small form factor data storage

Seong-Hyok Kim, Youngjoo Yee, Junghoon Choi, +4

EngineeringMicrofabricationAerospace EngineeringMechanical EngineeringMechatronics +11

The Emitter Having Microcrystalline Surface in Silicon Heterojunction Interdigitated Back Contact Solar Cells

Kwang‐Sun Ji, Hojung Syn, Junghoon Choi, +2

Japanese Journal of Applied Physics

EngineeringEmitter CaseSemiconductor MaterialsAmorphous Si EmitterPhotovoltaic Devices +17