Extracting mobility-lifetime product in solar cell absorbers using quantum efficiency analysis

Jeremy R. Poindexter, Riley E. Brandt, Niall M. Mangan, Tonio Buonassisi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The long-wavelength quantum efficiency (QE) response of photovoltaic absorbers is determined by the length scales for minority carrier collection. However, extracting quantitative measurements of minority carrier mobility-lifetime product (jut) is complicated by uncertainty in other factors such as the depletion width, electric field, and the absorption coefficient. We apply previously developed methods to obtain estimates for ja in a tin(Il) sulfide (SnS) solar cell. We compare three analytic models for the minority carrier collection probability as a function of absorber depth to determine which model most accurately captures the behavior in our devices. For models in which multiple parameters are unconstrained, a random numerical search is used to optimize the fit to experimental QE for SnS. To identify sources of error, we perform a sensitivity analysis by fitting with SCAPS-1D. Our analysis shows that changes in absorption most strongly affect estimates for /.a, highlighting the need to obtain accurate, device-specific absorption data. Further modeling and experimental constraints are required to obtain self- consistent values for jit that correspond to actual device performance.

Original languageEnglish (US)
Title of host publicationRecent Advances in Photovoltaics
EditorsMarkus Gloeckler, Jean V. Manca, Tingkai Li, Ivan Mora-Sero, Akira Yamada, Tsutomu Miyasaka, Yanfa Yan, Jin Young Kim, Koen Vandewal, Kai Zhu, Qi Wang, Ayodhya N. Tiwari, Mats Andersson, Emilio Palomares, Michael Mastro, Meng Tao
PublisherMaterials Research Society
Pages139-144
Number of pages6
ISBN (Electronic)9781605117485
DOIs
StatePublished - Jan 1 2016
Event2015 MRS Spring Meeting - San Francisco, United States
Duration: Apr 6 2015Apr 10 2015

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1771
ISSN (Print)0272-9172

Other

Other2015 MRS Spring Meeting
CountryUnited States
CitySan Francisco
Period4/6/154/10/15

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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