Improved efficiency of n-ZnO/p-Si based photovoltaic cells by band offset engineering
PBN-AR
Instytucja
Instytut Fizyki Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
SOLAR ENERGY MATERIALS AND SOLAR CELLS
ISSN
0927-0248
EISSN
Wydawca
ELSEVIER SCIENCE BV
DOI
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
164-170
Numer tomu
147
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
Solar cells Zinc oxide Alloying Atomic layer deposition
Streszczenia
Język
en
Treść
The theoretical approach towards improving the photovoltaic response of n-ZnO/p-Si heterojunctions proposed by Knutsen et al. [Phys. Status Solidi A 210 (2013) 585-588] has been experimentally tested. AZO/n-Zn((1-x))MgxO layers were deposited at 160 degrees C on p-Si substrates by atomic layer deposition (ALD) with magnesium concentration in the 0-4 at% range. The examined devices showed a reduction of the conduction band offset from (0.63 +/- 0.03) eV to (0.48 +/- 0.03) eV. This decrease leads to a diminishing impact of recombination centers at the interface between zinc oxide based layers and silicon substrate, when the Mg content is below similar to 1.6 at%. In this range, the overall photovoltaic efficiency increased from similar to 3.7% to similar to 6.0%. As a next step, we tested solar cells with similar magnesium concentration in the Zn(1-x)MgxO layer, but deposited at 300 degrees C. Due to the higher deposition temperature, a further 1.1% increase in efficiency has been obtained. So far, this is the highest reported efficiency for a ZnO/Si heterojunction grown by ALD method, thus experimentally confirming the validity of the approaches here studied for raising the efficiency of heterojunctions solar cells based on n-ZnO/p-Si, while significantly reducing the fabrication complexity respect to conventional Si based devices as emphasized by Hussain et al. [Sol. Energy Mater. Sol. Cells 139 (2015) 95-100]. (C) 2015 Elsevier B.V. All rights reserved.
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Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Original article
Original article presents the results of original research or experiment.
Inne
System-identifier
PBN-R:719904
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