Print Email Facebook Twitter Doped hydrogenated nanocrystalline silicon oxide layers for high-efficiency c-Si heterojunction solar cells Title Doped hydrogenated nanocrystalline silicon oxide layers for high-efficiency c-Si heterojunction solar cells Author Zhao, Y. (TU Delft Photovoltaic Materials and Devices) Mazzarella, L. (TU Delft Photovoltaic Materials and Devices) Procel Moya, P.A. (TU Delft Photovoltaic Materials and Devices) Han, C. (TU Delft Photovoltaic Materials and Devices; Nankai University; Shenzhen Institute of Wide-bandgap Semiconductors) Yang, G. (TU Delft Photovoltaic Materials and Devices) Weeber, A.W. (TU Delft Photovoltaic Materials and Devices; ECN Solar Energy) Zeman, M. (TU Delft Electrical Sustainable Energy) Isabella, O. (TU Delft Photovoltaic Materials and Devices) Department Electrical Sustainable Energy Date 2020 Abstract Hydrogenated nanocrystalline silicon oxide (nc-SiOx:H) layers exhibit promising optoelectrical properties for carrier-selective-contacts in silicon heterojunction (SHJ) solar cells. However, achieving high conductivity while preserving crystalline silicon (c-Si) passivation quality is technologically challenging for growing thin layers (less than 20 nm) on the intrinsic hydrogenated amorphous silicon ((i)a-Si:H) layer. Here, we present an evaluation of different strategies to improve optoelectrical parameters of SHJ contact stacks founded on highly transparent nc-SiOx:H layers. Using plasma-enhanced chemical vapor deposition, we firstly investigate the evolution of optoelectrical parameters by varying the main deposition conditions to achieve layers with refractive index below 2.2 and dark conductivity above 1.00 S/cm. Afterwards, we assess the electrical properties with the application of different surface treatments before and after doped layer deposition. Noticeably, we drastically improve the dark conductivity from 0.79 to 2.03 S/cm and 0.02 to 0.07 S/cm for n- and p-contact, respectively. We observe that interface treatments after (i)a-Si:H deposition not only induce prompt nucleation of nanocrystals but also improve c-Si passivation quality. Accordingly, we demonstrate fill factor improvement of 13.5%abs from 65.6% to 79.1% in front/back-contacted solar cells. We achieve conversion efficiency of 21.8% and 22.0% for front and rear junction configurations, respectively. The optical effectiveness of contact stacks based on nc-SiOx:H is demonstrated by averagely 1.5 mA/cm2 higher short-circuit current density thus nearly 1%abs higher cell efficiency as compared with the (n)a-Si:H. Subject carrier-selective-contacts (CSCs)hydrogenated nanocrystalline silicon oxide (nc-SiO:H)interface treatmentsoptoelectrical propertiessilicon heterojunction (SHJ) To reference this document use: http://resolver.tudelft.nl/uuid:f6b71db8-d0db-41d4-9bda-ba3cb02c3936 DOI https://doi.org/10.1002/pip.3256 ISSN 1062-7995 Source Progress in Photovoltaics: research and applications, 28 (5), 425-435 Bibliographical note green Part of collection Institutional Repository Document type journal article Rights © 2020 Y. Zhao, L. Mazzarella, P.A. Procel Moya, C. Han, G. Yang, A.W. Weeber, M. Zeman, O. Isabella Files PDF Zhao_et_al_2020_Progress_ ... ations.pdf 1.96 MB Close viewer /islandora/object/uuid:f6b71db8-d0db-41d4-9bda-ba3cb02c3936/datastream/OBJ/view