Silicon heterojunction solar cells with up to 26.81% efficiency achieved by electrically optimized nanocrystalline-silicon hole contact layers
Hao Lin (TU Delft - Cyber Security, Sun Yat-sen University, LONGi Green Energy Technology)
Miao Yang (LONGi Green Energy Technology)
Xiaoning Ru (LONGi Green Energy Technology)
Genshun Wang (Sun Yat-sen University, LONGi Green Energy Technology)
Shi Yin (LONGi Green Energy Technology)
Fuguo Peng (LONGi Green Energy Technology)
Can Han (TU Delft - Photovoltaic Materials and Devices, Sun Yat-sen University)
Paul Procel (TU Delft - Photovoltaic Materials and Devices)
Olindo Isabella (TU Delft - Photovoltaic Materials and Devices)
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Abstract
Silicon heterojunction (SHJ) solar cells have reached high power conversion efficiency owing to their effective passivating contact structures. Improvements in the optoelectronic properties of these contacts can enable higher device efficiency, thus further consolidating the commercial potential of SHJ technology. Here we increase the efficiency of back junction SHJ solar cells with improved back contacts consisting of p-type doped nanocrystalline silicon and a transparent conductive oxide with a low sheet resistance. The electrical properties of the hole-selective contact are analysed and compared with a p-type doped amorphous silicon contact. We demonstrate improvement in the charge carrier transport and a low contact resistivity (<5 mΩ cm2). Eventually, we report a series of certified power conversion efficiencies of up to 26.81% and fill factors up to 86.59% on industry-grade silicon wafers (274 cm2, M6 size).
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