The best replacement for photoelectric is ionization.

The best alternatives to photoelectric are rated as following:
★★★★★  ionization
★★★★  ionization smoke detectors
★★★  ionization smoke alarms
★★★  ionization smoke detector
★★  photovoltaic
★★  ion smoke detector
★★  ionization detectors
★  ion smoke detectors
★  ionization smoke alarm
★  compton
★  ionic smoke detectors
★  ionisation smoke alarm
★  ionization detector
★  ion smoke alarm
★  optical smoke detector
★  ionisation
  ionization type smoke detectors
  ionization fire alarm
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  ionization smoke detector better
  ionization alarms
  ionisation smoke alarms
  compton scattering

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