Monolithic Organic/Colloidal Quantum Dot Hybrid Tandem Solar Cells via Buffer Engineering

Hong Il Kim, Se Woong Baek, Min Jae Choi, Bin Chen, Olivier Ouellette, Kyoungwon Choi, Benjamin Scheffel, Hyuntae Choi, Margherita Biondi, Sjoerd Hoogland, F. Pelayo García de Arquer, Taiho Park, Edward H. Sargent*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Monolithically integrated hybrid tandem solar cells (TSCs) that combine solution-processed colloidal quantum dot (CQD) and organic molecules are a promising device architecture, able to complement the absorption across the visible to the infrared. However, the performance of organic/CQD hybrid TSCs has not yet surpassed that of single-junction CQD solar cells. Here, a strategic optical structure is devised to overcome the prior performance limit of hybrid TSCs by employing a multibuffer layer and a dual near-infrared (NIR) absorber. In particular, a multibuffer layer is introduced to solve the problem of the CQD solvent penetrating the underlying organic layer. In addition, the matching current of monolithic TSCs is significantly improved to 15.2 mA cm−2 by using a dual NIR organic absorber that complements the absorption of CQD. The hybrid TSCs reach a power conversion efficiency (PCE) of 13.7%, higher than that of the corresponding individual single-junction cells, representing the highest efficiency reported to date for CQD-based hybrid TSCs.

Original languageEnglish (US)
Article number2004657
JournalAdvanced Materials
Volume32
Issue number42
DOIs
StatePublished - Oct 1 2020

Keywords

  • colloidal quantum dot solar cells
  • dual near-infrared absorbers
  • hybrid tandem solar cells
  • interface engineering
  • organic solar cells

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • General Materials Science

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