No Cover Image

Journal article 226 views 35 downloads

Towards Efficient Integrated Perovskite/Organic Bulk Heterojunction Solar Cells: Interfacial Energetic Requirement to Reduce Charge Carrier Recombination Losses

Matyas Daboczi, Jinhyun Kim, Jinho Lee, Hongkyu Kang, Iain Hamilton, Chieh‐Ting Lin, Stoichko Dimitrov Orcid Logo, Martyn A. McLachlan, Kwanghee Lee, James Durrant Orcid Logo, Ji‐Seon Kim

Advanced Functional Materials, Start page: 2001482

Swansea University Authors: Stoichko Dimitrov Orcid Logo, James Durrant Orcid Logo

  • 54163.pdf

    PDF | Version of Record

    Released under the terms of the Creative Commons Attribution License (CC-BY).

    Download (1.31MB)

Check full text

DOI (Published version): 10.1002/adfm.202001482

Abstract

Integrated perovskite/organic bulk heterojunction (BHJ) solar cells have the potential to enhance the efficiency of perovskite solar cells by a simple one‐step deposition of an organic BHJ blend photoactive layer on top of the perovskite absorber. It is found that inverted structure integrated solar...

Full description

Published in: Advanced Functional Materials
ISSN: 1616-301X 1616-3028
Published: Wiley 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa54163
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: Integrated perovskite/organic bulk heterojunction (BHJ) solar cells have the potential to enhance the efficiency of perovskite solar cells by a simple one‐step deposition of an organic BHJ blend photoactive layer on top of the perovskite absorber. It is found that inverted structure integrated solar cells show significantly increased short‐circuit current (Jsc) gained from the complementary absorption of the organic BHJ layer compared to the reference perovskite‐only devices. However, this increase in Jsc is not directly reflected as an increase in power conversion efficiency of the devices due to a loss of fill factor. Herein, the origin of this efficiency loss is investigated. It is found that a significant energetic barrier (≈250 meV) exists at the perovskite/organic BHJ interface. This interfacial barrier prevents efficient transport of photogenerated charge carriers (holes) from the BHJ layer to the perovskite layer, leading to charge accumulation at the perovskite/BHJ interface. Such accumulation is found to cause undesirable recombination of charge carriers, lowering surface photovoltage of the photoactive layers and device efficiency via fill factor loss. The results highlight a critical role of the interfacial energetics in such integrated cells and provide useful guidelines for photoactive materials (both perovskite and organic semiconductors) required for high‐performance devices.
Start Page: 2001482