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Copolymer‐Templated Nickel Oxide for High‐Efficiency Mesoscopic Perovskite Solar Cells in Inverted Architecture
Author(s) -
Sadegh Faranak,
Akin Seckin,
Moghadam Majid,
Keshavarzi Reza,
Mirkhani Valiollah,
RuizPreciado Marco A.,
Akman Erdi,
Zhang Hong,
Amini Mina,
Tangestaninejad Shahram,
MohammadpoorBaltork Iraj,
Graetzel Michael,
Hagfeldt Anders,
Tress Wolfgang
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202102237
Subject(s) - non blocking i/o , mesoscopic physics , materials science , nickel oxide , fabrication , perovskite (structure) , nanotechnology , chemical engineering , oxide , nanostructure , planar , optoelectronics , organic chemistry , metallurgy , condensed matter physics , medicine , physics , alternative medicine , computer graphics (images) , pathology , computer science , engineering , chemistry , catalysis
Despite the outstanding role of mesoscopic structures on the efficiency and stability of perovskite solar cells (PSCs) in the regular (n–i–p) architecture, mesoscopic PSCs in inverted (p–i–n) architecture have rarely been reported. Herein, an efficient and stable mesoscopic NiO x (mp‐NiO x ) scaffold formed via a simple and low‐cost triblock copolymer template‐assisted strategy is employed, and this mp‐NiO x film is utilized as a hole transport layer (HTL) in PSCs, for the first time. Promisingly, this approach allows the fabrication of homogenous, crack‐free, and robust 150 nm thick mp‐NiO x HTLs through a facile chemical approach. Such a high‐quality templated mp‐NiO x structure promotes the growth of the perovskite film yielding better surface coverage and enlarged grains. These desired structural and morphological features effectively translate into improved charge extraction, accelerated charge transportation, and suppressed trap‐assisted recombination. Ultimately, a considerable efficiency of 20.2% is achieved with negligible hysteresis which is among the highest efficiencies for mp‐NiO x based inverted PSCs so far. Moreover, mesoscopic devices indicate higher long‐term stability under ambient conditions compared to planar devices. Overall, these results may set new benchmarks in terms of performance for mesoscopic inverted PSCs employing templated mp‐NiO x films as highly efficient, stable, and easy fabricated HTLs.