Characterization of efficiency-limiting resistance losses in monolithically integrated Cu(In,Ga)Se2 solar modules.

Abstract:

:The cell-to-module efficiency gap in Cu(In,Ga)Se2 (CIGS) monolithically integrated solar modules is enhanced by contact resistance between the Al-doped ZnO (AZO) and Mo back contact layers, the P2 contact, which connects adjacent cells. The present work evaluated the P2 contact resistance, in addition to the TCO resistance, using an embedded transmission line structure in a commercial-grade module without using special sample fabrication methods. The AZO layers between cells were not scribed; instead, the CIGS/CdS/i-ZnO/AZO device was patterned in a long stripe to permit measurement of the Mo electrode pair resistance over current paths through two P2 contacts (Mo/AZO) and along the AZO layer. The intercept and slope of the resistance as a function of the electrode interval yielded the P2 contact resistance and the TCO resistance, respectively. Calibration of the parasitic resistances is discussed as a method of improving the measurement accuracy. The contribution of the P2 contact resistance to the series resistance was comparable to that of the TCO resistance, and its origin was attributed to remnant MoSe2 phases in the P2 region, as verified by transmission electron microscopy.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Yoon JH,Park JK,Kim WM,Lee J,Pak H,Jeong JH

doi

10.1038/srep07690

subject

Has Abstract

pub_date

2015-01-09 00:00:00

pages

7690

issn

2045-2322

pii

srep07690

journal_volume

5

pub_type

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