A quantitative and spatially resolved analysis of the performance-bottleneck in high efficiency, planar hybrid perovskite solar cells

Draguta, Sergiu; Christians, Jeffrey A.; Morozov, Yurii V.; Mucunzi, Anselme; Manser, Joseph S.; Kamat, Prashant V.; Luther, Joseph M.; Kuno, Masaru

doi:10.1039/C7EE03654J

Title: A quantitative and spatially resolved analysis of the performance-bottleneck in high efficiency, planar hybrid perovskite solar cells

Journal Article · 19 February 2018 · Energy & Environmental Science

DOI: https://doi.org/10.1039/C7EE03654J · OSTI ID:1429608

Draguta, Sergiu ^[1];

^[2]; Morozov, Yurii V. ^[3]; Mucunzi, Anselme ^[1];

^[2];

^[3];

^[2];

^[3]

Univ. of Notre Dame, IN (United States)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Univ. of Notre Dame, IN (United States). Notre Dame Radiation Lab. (NDRL)

Hybrid perovskites represent a potential paradigm shift for the creation of low-cost solar cells. Current power conversion efficiencies (PCEs) exceed 22%. However, despite this, record PCEs are still far from their theoretical Shockley–Queisser limit of 31%. To increase these PCE values, there is a pressing need to understand, quantify and microscopically model charge recombination processes in full working devices. Here, we present a complete microscopic account of charge recombination processes in high efficiency (18–19% PCE) hybrid perovskite (mixed cation and methylammonium lead iodide) solar cells. We employ diffraction-limited optical measurements along with relevant kinetic modeling to establish, for the first time, local photoluminescence quantum yields, trap densities, trapping efficiencies, charge extraction efficiencies, quasi-Fermi-level splitting, and effective PCE estimates. Correlations between these spatially resolved parameters, in turn, allow us to conclude that intrinsic electron traps in the perovskite active layers limit the performance of these state-of-the-art hybrid perovskite solar cells.

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 1429608

Report Number(s):: NREL/JA-5900-70074

Journal Information:: Energy & Environmental Science, Vol. 11, Issue 4; ISSN 1754-5692

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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