12.+CdTe+Solar+cells

12.+CdTe+Solar+cells - MATSCI 302 4/28/2008...

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Cadmium Telluride Solar Cells MATSCI 302 4/28/2008
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2 Advantages of CdTe thin film solar cells Advantages of CdTe thin film solar cells Direct bandgap, Eg=1.5eV High efficiency (Record:16.5%; Industry: 10.5%) High module production speed Cheap substrate (commercial glass) Low materials consumption(<10g/m 2 ) Long term stability (20 years)
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3 Handbook of Photovoltaic Science and Engineering Absorption Spectrum
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4     Problems of CdTe p-n Homo-junction Problems of CdTe p-n Homo-junction Too many photons are absorbed close to the surface where recombination is fast. CdTe tends to be p-type Difficult to manufacture n-conducting Solution: introduce a n-type hetero-junction partner, CdS (1972) CdS: tends to be n-type, large bandgap(2.42eV), low absorption coefficient. P-type CdTe N-type CdTe Light
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5 Basic Superstrate CdTe Solar Cell  Basic Superstrate CdTe Solar Cell  Structure Structure Glass Superstrate Transparent Conducting Oxide  N-type CdS  P-type CdTe Metal Back Contact: Cathode Front Contact:  Anode Window Layer Absorber layer Incident Light 3~8 um 0.1 um 0.05 um ~1000 um
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Heterojunctions 6 See pages 227-232 from Streetman’s text on the course website
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7 Energy Band Diagram Energy Band Diagram Heavily n-doped Lightly p-doped 2.42 eV 2.42 eV 1.5 eV 1.5 eV E v E c
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8 CdS window Layer
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This note was uploaded on 12/01/2011 for the course MS&E 302 taught by Professor Mcghee during the Spring '08 term at Stanford.

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12.+CdTe+Solar+cells - MATSCI 302 4/28/2008...

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