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Surface engineering of TiO2 ETL for highly efficient and hysteresis-less planar perovskite solar cell (21.4%) with enhanced open-circuit voltage and stability

Tavakoli, M. M ; Sharif University of Technology | 2018

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  1. Type of Document: Article
  2. DOI: 10.1002/aenm.201800794
  3. Publisher: Wiley-VCH Verlag , 2018
  4. Abstract:
  5. Interfacial studies and band alignment engineering on the electron transport layer (ETL) play a key role for fabrication of high-performance perovskite solar cells (PSCs). Here, an amorphous layer of SnO2 (a-SnO2) between the TiO2 ETL and the perovskite absorber is inserted and the charge transport properties of the device are studied. The double-layer structure of TiO2 compact layer (c-TiO2) and a-SnO2 ETL leads to modification of interface energetics, resulting in improved charge collection and decreased carrier recombination in PSCs. The optimized device based on a-SnO2/c-TiO2 ETL shows a maximum power conversion efficiency (PCE) of 21.4% as compared to 19.33% for c-TiO2 based device. Moreover, the modified device demonstrates a maximum open-circuit voltage (Voc) of 1.223 V with 387 mV loss in potential, which is among the highest reported value for PSCs with negligible hysteresis. The stability results show that the device on c-TiO2/a-SnO2 retains about 91% of its initial PCE value after 500 h light illumination, which is higher than pure c-TiO2 (67%) based devices. Interestingly, using a-SnO2/c-TiO2 ETL the PCE loss was only 10% of initial value under continuous UV light illumination after 30 h, which is higher than that of c-TiO2 based device (28% PCE loss). © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
  6. Keywords:
  7. Amorphous SnO2 ; C-TiO2 ; Efficiency ; Perovskites ; Stability ; UV stability ; Cell engineering ; Convergence of numerical methods ; Efficiency ; Electron transport properties ; Hysteresis ; Open circuit voltage ; Perovskite ; Solar cells ; Stability ; Timing circuits ; Titanium dioxide ; Carrier recombination ; Double layer structure ; Electron transport layers ; Interface energetics ; Light illumination ; Surface engineering ; UV stability ; UV-light illumination ; Perovskite solar cells
  8. Source: Advanced Energy Materials ; Volume 8, Issue 23 , 2018 ; 16146832 (ISSN)
  9. URL: https://onlinelibrary.wiley.com/doi/abs/10.1002/aenm.201800794