JP2016225563A5 - - Google Patents

Claims (10)

A solar cell manufacturing method comprising:
Preparing a substrate provided with a back electrode layer on the surface;
Forming a CZTS-based layer containing Cu, Zn, Sn, and Se on the back electrode layer;
Heating said CZTS based layer in an atmosphere containing Ge is melted, forming a light absorbing layer made of including C ZTS based compound Ge,
Forming a buffer layer on the light absorbing layer;
Forming a front electrode layer on the buffer layer.   The CZTS-based layer includes (1) Mg in which a part of Zn is substituted, (2) Si in which a part of Sn or Ge is substituted, and (3) S, Te or O in which a part of Se is substituted. The manufacturing method according to claim 1, further comprising at least one element. The CZTS-based compound _comprises Cu 2 Zn (Sn, Ge) compounds represented by Se _4, The method according to claim 1. The CZTS based _{compound, Cu 2 (Mg, Zn)} (Si, Ge, Sn) (S, Se) 4 containing a compound represented by the process of claim 2.   The manufacturing method according to claim 1, wherein the atmosphere containing Ge further contains Sn and Se.   6. The method according to claim 1 or 5, wherein the step of forming the light absorption layer includes a step of heating the CZTS-based layer at a temperature in a range of 450 to 550C. The manufacturing method according to claim 1 or 5, wherein a particle size of the CZTS compound includes a length equal to or greater than a film thickness of the light absorption layer. A substrate having a back electrode layer on the surface;
A light absorbing layer provided on the back side electrode layer, a light absorbing layer made of including C ZTS based compound Ge,
A buffer layer on the light absorbing layer;
A solar cell comprising: a front electrode layer on the buffer layer. The CZTS-based compound includes at least one of compounds represented by Cu ₂ Zn (Sn, Ge) Se ₄ or Cu ₂ (Mg, Zn) (Si, Ge, Sn) (S, Se) _4. Item 9. The solar cell according to Item 8. The solar cell according to claim 8, wherein the particle size of the CZTS-based compound includes a length equal to or greater than the film thickness of the light absorption layer.