Role of Photogenerated Iodine on the Energy-Conversion Properties of MoSe2 Nanoflake Liquid Junction Photovoltaics

ACS Applied Materials & Interfaces
Allan E IsenbergJustin B Sambur

Abstract

Transition metal dichalcogenides (TMDs) such as MoSe2 and WSe2 are efficient materials for converting solar energy to electrical energy in photoelectrochemical photovoltaic cells. One limiting factor of these liquid junction solar cells is that photogenerated oxidation products accumulate on the electrode surface and decrease the photocurrent efficiency. However, it is unclear where the reaction products accumulate on the electrode surface and how they impact the local photoelectrochemical response. This open question is especially important for the structurally heterogeneous TMD nanoflake thin-film electrodes that are promising for large-area solar energy conversion applications. Here, we use a single-nanoflake photoelectrochemical and Raman microscopy approach to probe how the photogenerated I2/I3- products impact the photocurrent collection efficiency and the onset potential in MoSe2-nanoflake|I-/I2|Pt photoelectrochemical solar cells. We observed localized I2/I3- deposition on all types of MoSe2 nanoflake surface motifs, including basal planes, perimeter edges, and interior step edges. Illuminated nanoflake spots with the highest photocurrent collection efficiency are the first to be limited by I2/I3- formation under high-i...Continue Reading

References

Jul 2, 2015·Nature Communications·Xiaoyun YuKevin Sivula
Jul 9, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·R SaitoM S Dresselhaus
Mar 18, 2017·Chemical Reviews·Chaoliang TanHua Zhang

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Citations

Nov 17, 2019·The Journal of Chemical Physics·Li WangJustin B Sambur
May 10, 2019·ACS Applied Materials & Interfaces·Li WangJustin B Sambur

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