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@article{Casabona-Cendra:2026:10.1002/smll.75942,
author = {Casabona-Cendra, L and Martínez-Domingo, C and Qiu, VY and Dong, X and Kos, D and Riera-Galindo, S and Campoy-Quiles, M and Kim, J-S and Mas-Torrent, M},
doi = {10.1002/smll.75942},
journal = {Small},
title = {Crystallinity Effects on Near-Infrared Photoresponse in Y6-Based Organic Phototransistors.},
url = {http://dx.doi.org/10.1002/smll.75942},
year = {2026}
}
TY - JOUR
AB - Organic phototransistors (OPTs) are appealing devices for the fabrication of low-cost, tuneable and highly sensitive light detectors. This study investigates the potential of single-component OPTs based on the non-fullerene acceptor Y6 to detect near-infrared (NIR) light. Y6 films are deposited via blade coating and subjected to thermal annealing between 200°C and 250°C. Morphological and structural characterization reveals a transition from amorphous to a polycrystalline phase above 200°C. Electrical measurements demonstrate enhanced electron mobility and reduced hysteresis in annealed devices. Under 840 nm illumination, amorphous films exhibit photoconductive behavior, while polycrystalline films show photogating/photogain effects, resulting in a significantly higher photoresponsivity and faster transient response times. The highest photoresponsivity of 127 A·W-1 and shot-noise-limited specific detectivity of 6·1012 Jones (6·1010 Jones under full noise analysis) are achieved in polycrystalline devices under low NIR light intensity (0.32 µW·cm-2) at VDS = VGS = 10 V, associated with enhanced charge carrier mobility rather than enhanced free charge generation. The devices also exhibit high cycling stability under continuous measurements and long-term shelf-stability when encapsulated. These findings establish thermally annealed Y6 films as a viable single-component material for efficient NIR photodetection.
AU - Casabona-Cendra,L
AU - Martínez-Domingo,C
AU - Qiu,VY
AU - Dong,X
AU - Kos,D
AU - Riera-Galindo,S
AU - Campoy-Quiles,M
AU - Kim,J-S
AU - Mas-Torrent,M
DO - 10.1002/smll.75942
PY - 2026///
TI - Crystallinity Effects on Near-Infrared Photoresponse in Y6-Based Organic Phototransistors.
T2 - Small
UR - http://dx.doi.org/10.1002/smll.75942
UR - https://www.ncbi.nlm.nih.gov/pubmed/42808826
ER -
