RT Journal Article
T1 Charge traps in all‐inorganic CsPbBr 3 perovskite nanowire field‐effect phototransistors
A1 Winterer, Felix
A1 Walter, Lisa Sophie
A1 Lenz, Jakob
A1 Seebauer, Stefan
A1 Tong, Yu
A1 Polavarapu , Lakshminarayana
A1 Weitz, Ralf Thomas
K1 2203.08 Fotoelectricidad
K1 2203 Electrónica
AB All-inorganic halide perovskite materials have recently emerged as outstanding materials for optoelectronic applications. However, although critical for developing novel technologies, the influence of charge traps on charge transport in all-inorganic systems still remains elusive. Here, the charge transport properties in cesium lead bromide, nanowire films are probed using a field-effect transistor geometry. Field-effect mobilities of μFET = 4 × 10−3 cm−2 V−1 s−1 and photoresponsivities in the range of R = 25 A W−1 are demonstrated. Furthermore, charge transport both with and without illumination is investigated down to cryogenic temperatures. Without illumination, deep traps dominate transport and the mobility freezes out at low temperatures. Despite the presence of deep traps, when illuminating the sample, the field-effect mobility increases by several orders of magnitude and even phonon-limited transport characteristics are visible. This can be seen as an extension to the notion of “defect tolerance” of perovskite materials that has solely been associated with shallow traps. These findings provide further insight in understanding charge transport in perovskite materials and underlines that managing deep traps can open up a route to optimizing optoelectronic devices such as solar cells or phototransistors operable also at low light intensities
PB Advanced Electronic Materials
SN 2199160X
YR 2021
FD 2021-05-06
LK http://hdl.handle.net/11093/3189
UL http://hdl.handle.net/11093/3189
LA eng
NO Advanced Electronic Materials, 7(6): 2100105 (2021)
NO Deutsche Forschungsgemeinschaft | Ref. EXC‐2111‐390814868
DS Investigo
RD 16-sep-2024