title: Illumination Angle Insensitive Single Indium Phosphide Tapered Nanopillar Solar Cell.
abstract: Low cost, high efficiency photovoltaic can help accelerate the adoption of solar energy. Using tapered indium phosphide nanopillars grown on a silicon substrate, we demonstrate a single nanopillar photovoltaic exhibiting illumination angle insensitive response. The photovoltaic employs a novel regrown core-shell p-i-n junction to improve device performance by eliminating shunt current paths, resulting in a high VOC of 0.534 V and a power conversion efficiency of 19.6%. Enhanced broadband light absorption is also demonstrated over a wide spectral range of 400-800 nm.
authors.affiliation: †Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, California 94720, United States.
authors.forename: Wai Son
authors.initials: WS
authors.lastname: Ko
authors.affiliation: †Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, California 94720, United States.
authors.forename: Thai-Truong D
authors.initials: TT
authors.lastname: Tran
authors.affiliation: †Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, California 94720, United States.
authors.forename: Indrasen
authors.initials: I
authors.lastname: Bhattacharya
authors.affiliation: †Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, California 94720, United States.
authors.forename: Kar Wei
authors.initials: KW
authors.lastname: Ng
authors.affiliation: †Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, California 94720, United States.|‡Department of Electronic Engineering, Tsinghua University, Beijing, 100084, People's Republic of China.
authors.forename: Hao
authors.initials: H
authors.lastname: Sun
authors.affiliation: †Department of Electrical Engineering and Computer Sciences, University of California at Berkeley, Berkeley, California 94720, United States.
authors.forename: Connie
authors.initials: C
authors.lastname: Chang-Hasnain
keywords: angle insensitive; nanopillar; nanowire; radial junction; silicon substrate; solar cell