Cheon, Sieun Jeong, Doo Seok Park, Jong-Keuk Kim, Won Mok Lee, Taek Sung Lee, Heon Kim, Inho 2024-01-19T23:03:37Z 2024-01-19T23:03:37Z 2021-09-03 2018-03-28 0022-3727 https://pubs.kist.re.kr/handle/201004/121579 Optimally designed Si nanostructures are very effective for light trapping in crystalline silicon (c-Si) solar cells. However, when the lateral feature size of Si nanostructures is comparable to the junction depth of the emitter, dopant diffusion in the lateral direction leads to excessive doping in the nanostructured emitter whereby poor blue responses arise in the external quantum efficiency (EQE). The primary goal of this study is to find the correlation of emitter junction depth and carrier collection efficiency in nanostructured c-Si solar cells in order to enhance the blue responses. We prepared Si nanostructures of nanocone shape by colloidal lithography, with silica beads of 520 nm in diameter, followed by a reactive ion etching process. c-Si solar cells with a standard cell architecture of an Al back surface field were fabricated varying the emitter junction depth. We varied the emitter junction depth by adjusting the doping level from heavy doping to moderate doping to light doping and achieved greatly enhanced blue responses in EQE from 47%-92% at a wavelength of 400 nm. The junction depth analysis by secondary ion mass-spectroscopy profiling and the scanning electron microscopy measurements provided us with the design guide of the doping level depending on the nanostructure feature size for high efficiency nanostructured c-Si solar cells. Optical simulations showed us that Si nanostructures can serve as an optical resonator to amplify the incident light field, which needs to be considered in the design of nanostructured c-Si solar cells. English IOP PUBLISHING LTD SILICON Enhanced blue responses in nanostructured Si solar cells by shallow doping Article 10.1088/1361-6463/aaaee4 1 JOURNAL OF PHYSICS D-APPLIED PHYSICS, v.51, no.12 JOURNAL OF PHYSICS D-APPLIED PHYSICS 51 12 scie scopus 000426377600002 2-s2.0-85043502944 Physics, Applied Physics Article SILICON crystalline Si solar cell nanostructured Si solar cell Auger recombination Blue response