To enhance the performance of the phase shifter, the PM6:Y7 blend was examined under high-temperature conditions (60 C) and simultaneous illumination (to compare the outdoor performance). We noted an enhancement in the phase shift to 42 • (FOM = 16.8 deg/dB) at 40 V, which is attributable to the increased mobility of charge carriers at higher temperatures. However, under illuminated conditions, the phase shifting capability was reduced to 24 • (FOM = 6.4 deg/dB), thereby highlighting the intricate interplay between the temperature, illumination, and electronic properties of the phase shifter.