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High-efficiency heterojunction solar cells on crystalline germanium substrates
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10.1063/1.4737166
/content/aip/journal/apl/101/3/10.1063/1.4737166
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/3/10.1063/1.4737166

Figures

Image of FIG. 1.
FIG. 1.

Schematic cross-sections of the HJ solar cells fabricated on (a) n-type and (b) p-type c-Ge substrates.

Image of FIG. 2.
FIG. 2.

Effective minority carrier lifetimes measured by μ-PCD on n-type and p-type c-Ge substrates passivated by intrinsic a-Si:H or μc-Si:H layer on both sides, as a function of annealing temperature. Annealing was performed in dry nitrogen ambient for 10 min.

Image of FIG. 3.
FIG. 3.

Atomic concentration of hydrogen in ∼50 nm thick a-Si:H and ∼40 nm thick μc-Si:H films grown on p-type c-Ge substrates measured by secondary ion mass spectrometry (SIMS) for as-deposited films and films annealed at 225 °C or 325 °C for 10 min.

Image of FIG. 4.
FIG. 4.

Schematic energy band alignment at the heterojunction formed by a-Si:H or μc-Si:H on c-Ge for (a) n-type c-Ge and (b) p-type c-Ge substrates.

Image of FIG. 5.
FIG. 5.

Evolution of the light I–V curves of p-type c-Ge solar cells with n+ doped a-Si:H/μc-Si:H emitter contact and aluminum back contact (no back surface field) as a function of annealing temperature.

Image of FIG. 6.
FIG. 6.

Light I–V characteristics of the fabricated HJ solar cells showing conversion efficiencies of 5.9% and 7.2% under an intensity of 1 sun on n-type and p-type c-Ge substrates, respectively.

Tables

Generic image for table
Table I.

Comparison of the substrate properties and electrical characteristics of the HJ c-Ge solar cells presented in this work with the highest efficiency diffused-junction c-Ge cells (Ref. 5 ).

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/content/aip/journal/apl/101/3/10.1063/1.4737166
2012-07-17
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: High-efficiency heterojunction solar cells on crystalline germanium substrates
http://aip.metastore.ingenta.com/content/aip/journal/apl/101/3/10.1063/1.4737166
10.1063/1.4737166
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