Azahomofullerenes as new n-type acceptor materials for efficient and stable inverted planar perovskite solar cells

Chavan, R. D ; Sharif University of Technology | 2021

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  1. Type of Document: Article
  2. DOI: 10.1021/acsami.1c01685
  3. Publisher: American Chemical Society , 2021
  4. Abstract:
  5. Fullerene derivatives with a strong electron-accepting ability play a crucial role in enhancing both the performance and stability of perovskite solar cells (PSCs). However, most of the used fullerene molecules are based on [6,6]-phenyl-C61-butyric acid methyl ester (PCBM), which limits the device performance due to difficulties in preparing high-quality and uniform thin films. Herein, solution-processable azahomofullerene (AHF) derivatives (abbreviated as AHF-1 and AHF-2) are reported as novel and effective electron-transport layers (ETLs) in p-i-n planar PSCs. Compared to the control PCBM ETL-based PSCs, the devices based on AHFs exhibit higher photovoltaic performances, which is attributed to the enhanced charge-transport properties and improved layer morphology leading to a maximum power conversion efficiency (PCE) of 20.21% in the case of the device based on AHF-2 ETL. Besides, due to the preferable energy band alignment with the perovskite layer, reduced trap states, and suppressed charge recombination, the device with AHF-2 ETL exhibits significantly suppressed hysteresis and improved stability under both ambient and thermal conditions. © 2021 American Chemical Society. All rights reserved
  6. Keywords:
  7. Butyric acid ; Conversion efficiency ; Electron transport properties ; Fullerenes ; Morphology ; Perovskite ; Charge recombinations ; Effective electrons ; Energy-band alignment ; Fullerene derivative ; Fullerene molecules ; Photovoltaic performance ; Solution processable ; [6 ,6]-phenyl-C61-butyric acid methyl esters ; Perovskite solar cells
  8. Source: ACS Applied Materials and Interfaces ; Volume 13, Issue 17 , 2021 , Pages 20296-20304 ; 19448244 (ISSN)
  9. URL: https://pubs.acs.org/doi/10.1021/acsami.1c01685