Wallentin, J.J.WallentinAnttu, NicklasNicklasAnttuAsoli, D.D.AsoliHuffman, M.M.HuffmanAberg, I.I.AbergMagnusson, M.H.M.H.MagnussonSiefer, GeraldGeraldSieferFuß-Kailuweit, PeterPeterFuß-KailuweitDimroth, FrankFrankDimrothWitzigmann, B.B.WitzigmannXu, H.Q.H.Q.XuSamuelson, L.L.SamuelsonDeppert, K.K.DeppertBorgström, Magnus T.Magnus T.Borgström2022-03-042022-03-042013https://publica.fraunhofer.de/handle/publica/23224110.1126/science.12309692-s2.0-84874355840Photovoltaics based on nanowire arrays could reduce cost and materials consumption compared with planar devices but have exhibited low efficiency of light absorption and carrier collection. We fabricated a variety of millimeter-sized arrays of p-type/intrinsic/n-type (p-i-n) doped InP nanowires and found that the nanowire diameter and the length of the top n-segment were critical for cell performance. Efficiencies up to 13.8% (comparable to the record planar InP cell) were achieved by using resonant light trapping in 180-nanometer-diameter nanowires that only covered 12% of the surface. The share of sunlight converted into photocurrent (71%) was six times the limit in a simple ray optics description. Furthermore, the highest open-circuit voltage of 0.906 volt exceeds that of its planar counterpart, despite about 30 times higher surface-to-volume ratio of the nanowire cell.enMaterialien - Solarzellen und Technologiealternative Photovoltaik-TechnologieSolarzelle und BauelementFarbstoffOrganische und Neuartige SolarzellenIII-V Epitaxie und Solarzellen621500journal article