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(a) The variation in CNP with respect to T and t. Upon exposure to 10 bar of H2 pressure at 300 K, the CNP changes; it then changes slightly at 320 K and t = 300 min after exposure. Beyond 320 K/300 min, the slope of ΔVCNP/Δt increases. (b) Beyond 340 K/540 min, the hole mobility decreases significantly and finally reaches zero. After heating to 393 K for 3 hr, the ambipolarity is restored.
