TY - JOUR
T1 - Electrospun Tri-Cation Perovskite Nanofibers for Infrared Photodetection
AU - Kim, Min Woo
AU - Yuan, Yihang
AU - Jeong, Sehee
AU - Chong, Jenny
AU - Mølnås, Håvard
AU - Alaei, Aida
AU - Cleveland, Iver J.
AU - Liu, Na
AU - Ma, Yichen
AU - Strauf, Stefan
AU - Aydil, Eray S.
AU - Sahu, Ayaskanta
AU - Kalyon, Dilhan M.
AU - Lee, Stephanie S.
N1 - Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/11/3
Y1 - 2022/11/3
N2 - Tri-cation (Cs+/CH3NH3+/CH(NH2)2+) and dual-anion (Br–/I–) perovskites are promising light absorbers for inexpensive infrared (IR) photodetectors but degrade under prolonged IR exposure. Here, stable IR photodetectors based on electrospun tri-cation perovskite fibers infiltrated with hole-transporting π-conjugated small molecule 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9-spirobifluorene (Spiro-OMeTAD) are demonstrated. These hybrid perovskite photodetectors operate at a low bias of 5 V and exhibit ultra-high gains with external quantum efficiencies (EQEs) as high as 3009%, decreasing slightly to ≈2770% after 3 months in air. These EQE values are almost ten times larger than those measured for photodetectors comprising bilayer perovskite/Spiro-OMeTAD films. A high density of charge traps on electrospun fiber surfaces gives rise to a photomultiplication effect in which photogenerated holes can travel through the active layer multiple times before recombining with trapped electrons. Time-resolved photoluminescence and conductive atomic force microscopy mapping reveal the improved performance of electrospun fibers to originate from the significantly enhanced interfacial surface area between the perovskite and Spiro-OMeTAD compared to bilayers. As a solution-based, scalable and continuous method of depositing perovskite layers, electrospinning thus presents a promising strategy for the inexpensive fabrication of high-performance IR photodetectors for applications ranging from information technology to imaging.
AB - Tri-cation (Cs+/CH3NH3+/CH(NH2)2+) and dual-anion (Br–/I–) perovskites are promising light absorbers for inexpensive infrared (IR) photodetectors but degrade under prolonged IR exposure. Here, stable IR photodetectors based on electrospun tri-cation perovskite fibers infiltrated with hole-transporting π-conjugated small molecule 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9-spirobifluorene (Spiro-OMeTAD) are demonstrated. These hybrid perovskite photodetectors operate at a low bias of 5 V and exhibit ultra-high gains with external quantum efficiencies (EQEs) as high as 3009%, decreasing slightly to ≈2770% after 3 months in air. These EQE values are almost ten times larger than those measured for photodetectors comprising bilayer perovskite/Spiro-OMeTAD films. A high density of charge traps on electrospun fiber surfaces gives rise to a photomultiplication effect in which photogenerated holes can travel through the active layer multiple times before recombining with trapped electrons. Time-resolved photoluminescence and conductive atomic force microscopy mapping reveal the improved performance of electrospun fibers to originate from the significantly enhanced interfacial surface area between the perovskite and Spiro-OMeTAD compared to bilayers. As a solution-based, scalable and continuous method of depositing perovskite layers, electrospinning thus presents a promising strategy for the inexpensive fabrication of high-performance IR photodetectors for applications ranging from information technology to imaging.
KW - electrospinning
KW - high gain perovskite photodetectors
KW - mixed cations
KW - near infrared
KW - stability
UR - http://www.scopus.com/inward/record.url?scp=85136737633&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85136737633&partnerID=8YFLogxK
U2 - 10.1002/adfm.202207326
DO - 10.1002/adfm.202207326
M3 - Article
AN - SCOPUS:85136737633
SN - 1616-301X
VL - 32
JO - Advanced Functional Materials
JF - Advanced Functional Materials
IS - 45
M1 - 2207326
ER -