4.7 Article

Interface Engineering of Pb-Sn Low-Bandgap Perovskite Solar Cells for Improved Efficiency and Stability

Journal

SOLAR RRL
Volume 6, Issue 4, Pages -

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/solr.202100945

Keywords

grain growth; hole-selective layer modifications; interface passivation; low-bandgap perovskites; Pb-Sn-mixed perovskites; PTAA; stability improvements

Funding

  1. EDA University Center Program [ED18DEN3030025]
  2. NSF MRI [1428992]
  3. SD BOR RD Grant Program
  4. Planning IUCRC CEPS Projects

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By inserting a thin layer of hydrophobic PTAA as an intermediary layer in the charge interface layer of Pb-Sn-mixed low-bandgap perovskite solar cells, the photovoltaic parameters can be improved. The introduction of PTAA layer acts as a protective layer and reduces interfacial defects, leading to an increase in grain size and a decrease in grain boundaries, thereby enhancing charge collection efficiency and power conversion efficiency.
Because of their inferior film quality, Pb-Sn-mixed low-bandgap (LBG) perovskites suffer from poor charge transportation, compromising photovoltaic parameters of final solar cells. Herein, an approach to improve the quality of the charge interface layer is proposed, in which a thin layer of hydrophobic [bis (4-phenyl) (2, 4, 6-trimethylphenyl) amine] (PTAA) is inserted between the hole-selective layer of hydrophilic poly (3, 4-ethylenedioxythiophene) -polystyrenesulfonicacid (PEDOT:PSS) and LBG perovskite layer. The introduction of a tiny layer of the hydrophobic PTAA acts as a shield layer to protect the underlying acidic PEDOT:PSS layer from moisture-related degradation and works as an intermediary layer to facilitate the growth of significantly larger perovskite grains; these enlarged grains are indicative of enhanced crystallinity and fewer grain boundaries in the perovskite layer. The fewer grain boundaries lead to suppression of interfacial defects and result in enhanced charge collection at the hole transport layer/perovskite interface, thus improving the open-circuit voltage up to 0.85 V and fill factor up to approximate to 78%, eventually boosting the power conversion efficiency of the champion cell up to 19.08%. Herein, a simple interface engineering route to fabricate efficient and stable Pb-Sn-mixed LBG perovskite solar cells is offered.

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