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CUPID is a next-generation neutrinoless double-beta decay experiment thatwill require cryogenic light detectors to improve background suppression, viathe simultaneous readout of heat and light channels from its scintillatingcrystals. In this work we showcase light detectors based on a novel Ir-Ptbilayer transition edge sensor. We have performed a systematic study to improvethe thermal coupling between the photon absorber and the sensor, and therebyits responsivity. Our first devices meet CUPID's baseline noise requirement of<100~eV rms. Our detectors have risetimes of $\sim$180 $\mu$s and measuredtiming jitter of <20 $\mu$s for the expected signal-to-noise at the Q-value ofthe decay, which achieves the CUPID's criterion of rejecting two-neutrinodouble-beta decay pileup events. The current work will inform the fabricationof future devices, culminating in the final TES design and a scaleable readoutscheme for CUPID.

Large area photon calorimeter with Ir-Pt bilayer transition-edge sensor for the CUPID experiment