Moly-poly solar cell

None, None; None, None; None, None; None, None; None, None; None, None; None, None; None, None

Moly-poly solar cell

Industrial application of metal-oxide passivating contacts with a starting efficiency of 18.1%

Conference Paper (2018)

Author(s)

Pierpaolo Spinelli (ECN Solar Energy)

Mike Ah Sen (ECN Solar Energy)

Eelko G. Hoek (ECN Solar Energy)

Benjamin W.J. Kikkert (ECN Solar Energy)

Guangtao Yang (TU Delft - Photovoltaic Materials and Devices)

Olindo Isabella (TU Delft - Photovoltaic Materials and Devices)

Arthur W. Weeber (TU Delft - Photovoltaic Materials and Devices, ECN Solar Energy)

Paula C.P. Bronsveld (ECN Solar Energy)

DOI related publication

https://doi.org/10.1063/1.5049284 Final published version

To reference this document use

https://resolver.tudelft.nl/uuid:50aef804-ca17-4bff-ad94-d528d1b9ab5e

More Info

expand_more

Publication Year

2018

Language

English

Volume number

1999

Article number

040021

ISBN (print)

978-073541715-1

Event

Downloads counter

222

Abstract

We present large-area "moly-poly" cells, with a front side MoO_x/a-Si:H(i) passivating contact and a rear-side poly-Si/SiO_x stack, and we have demonstrated that MoO_x based c-Si solar cell technology can be scaled to industrial wafer size. Excellent surface passivation was achieved using MoO_x and poly-Si, leading to implied V_oc values above 700 mV, and a final cell V_oc of 687 mV. However, some care needs to be taken to avoid parasitic optical losses in the infra-red (IR) spectral range due to free-carrier absorption (FCA). These losses were investigated by comparing poly-Si layers of different thicknesses, deposited by low-pressure or plasma-enhanced chemical vapor deposition (LPCVD or PECVD), at the rear side of moly-poly cells. We found that ultra-thin PECVD layers are most suitable for solar cell applications due to a very good trade-off between surface passivation and reduced FCA. Based on this result, a 18.1% efficient 9.2 × 9.2 cm² moly-poly cell was made, which is the highest reported efficiency so far for moly-poly cells. Finally, we present a preliminary study of the parasitic IR losses in the MoO_x layer itself, when deposited on either a-Si:H or SiO_x passivation layers.