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Poly(4‐Vinylpyridine)‐Based Interfacial Passivation to Enhance Voltage and Moisture Stability of Lead Halide Perovskite Solar Cells
Author(s) -
Chaudhary Bhumika,
Kulkarni Ashish,
Jena Ajay Kumar,
Ikegami Masashi,
Udagawa Yosuke,
Kunugita Hideyuki,
Ema Kazuhiro,
Miyasaka Tsutomu
Publication year - 2017
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201700271
Subject(s) - passivation , perovskite (structure) , materials science , halide , hysteresis , polymer , chemical engineering , energy conversion efficiency , pedot:pss , perovskite solar cell , layer (electronics) , nanotechnology , optoelectronics , chemistry , composite material , inorganic chemistry , physics , quantum mechanics , engineering
It is well known that the surface trap states and electronic disorders in the solution‐processed CH 3 NH 3 PbI 3 perovskite film affect the solar cell performance significantly and moisture sensitivity of photoactive perovskite material limits its practical applications. Herein, we show the surface modification of a perovskite film with a solution‐processable hydrophobic polymer (poly(4‐vinylpyridine), PVP), which passivates the undercoordinated lead (Pb) atoms (on the surface of perovskite) by its pyridine Lewis base side chains and thereby eliminates surface‐trap states and non‐radiative recombination. Moreover, it acts as an electron barrier between the perovskite and hole‐transport layer (HTL) to reduce interfacial charge recombination, which led to improvement in open‐circuit voltage ( V oc ) by 120 to 160 mV whereas the standard cell fabricated in same conditions showed V oc as low as 0.9 V owing to dominating interfacial recombination processes. Consequently, the power conversion efficiency (PCE) increased by 3 to 5 % in the polymer‐modified devices (PCE=15 %) with V oc more than 1.05 V and hysteresis‐less J – V curves. Advantageously, hydrophobicity of the polymer chain was found to protect the perovskite surface from moisture and improved stability of the non‐encapsulated cells, which retained their device performance up to 30 days of exposure to open atmosphere (50 % humidity).