Multi-junction solar cell

Abstract

A multi-junction solar cell of an embodiment includes a first solar cell including a first photoelectric conversion device, a second solar cell including a plurality of second photoelectric conversion devices connected in series and having a back contact, and an insulating layer between the first solar cell and the second solar cell. A device isolation region is provided between the second photoelectric conversion devices connected in series.

What is claimed is: 
     
         1 . A multi-junction solar cell comprising:
 a first solar cell comprising a first photoelectric conversion device;   a second solar cell comprising a plurality of second photoelectric conversion devices connected in series and having a back contact; and   an insulating layer between the first solar cell and the second solar cell,   wherein a device isolation region is provided between the second photoelectric conversion devices connected in series.   
     
     
         2 . The solar cell according to  claim 1 , wherein the device isolation region exists in a part of the insulation layer. 
     
     
         3 . The solar cell according to  claim 1 , wherein the device isolation region is a region obtained by insulating 40% or more of a cross-sectional area between the second photoelectric conversion devices, the cross-sectional area connecting the second photoelectric conversion devices in series. 
     
     
         4 . The solar cell according to  claim 1 , wherein the first photoelectric conversion device comprises a photoelectric conversion layer containing any of a chalcopyrite-type compound semiconductor, a stannite-type compound semiconductor, and a kesterite-type compound semiconductor. 
     
     
         5 . The solar cell according to  claim 4 , wherein the second photoelectric conversion devices comprise a photoelectric conversion layer containing single-crystal silicon. 
     
     
         6 . The solar cell according to  claim 4 , wherein the device isolation region is an amorphous region accounting for 40% or more of a cross-sectional area between the second photoelectric conversion devices, the cross-sectional area connecting the second photoelectric conversion devices in series. 
     
     
         7 . The solar cell according to  claim 1 , further comprising a rectifying device connected in parallel to at least one of the first photoelectric conversion device and the second photoelectric conversion devices. 
     
     
         8 . The solar cell according to  claim 1 , further comprising a rectifying device connected in series with at least one of the first solar cell and the second solar cell. 
     
     
         9 . The solar cell according to  claim 1 , wherein the first solar cell and the second solar cell are connected in parallel.