The roles of carrier concentration and interface, bulk, and grain-boundary recombination for 25% efficient CdTe solar cells

Kanevce, A.; Reese, Matthew O.; Barnes, T. M.; Jensen, S. A.; Metzger, W. K.

doi:10.1063/1.4984320

Title: The roles of carrier concentration and interface, bulk, and grain-boundary recombination for 25% efficient CdTe solar cells

Journal Article · Tue Jun 06 00:00:00 EDT 2017 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4984320· OSTI ID:1371645

Kanevce, A. ^[1]; Reese, Matthew O. ^[1]; Barnes, T. M. ^[1];

^[1]; Metzger, W. K. ^[1]

National Renewable Energy Lab. (NREL), Golden, CO (United States)

CdTe devices have reached efficiencies of 22% due to continuing improvements in bulk material properties, including minority carrier lifetime. Device modeling has helped to guide these device improvements by quantifying the impacts of material properties and different device designs on device performance. One of the barriers to truly predictive device modeling is the interdependence of these material properties. For example, interfaces become more critical as bulk properties, particularly, hole density and carrier lifetime, increase. We present device-modeling analyses that describe the effects of recombination at the interfaces and grain boundaries as lifetime and doping of the CdTe layer change. The doping and lifetime should be priorities for maximizing open-circuit voltage (V_oc) and efficiency improvements. However, interface and grain boundary recombination become bottlenecks for device performance at increased lifetime and doping levels. In conclusion, this work quantifies and discusses these emerging challenges for next-generation CdTe device efficiency.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Solar Energy Technologies Office

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1371645

Alternate ID(s):: OSTI ID: 1366558

Report Number(s):: NREL/JA-5K00-67610; JAPIAU

Journal Information:: Journal of Applied Physics, Vol. 121, Issue 21; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 152 works

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Title: The roles of carrier concentration and interface, bulk, and grain-boundary recombination for 25% efficient CdTe solar cells

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