Camera tubes with a CdTe–Si heterojunction target have been fabricated to observe the electrical effects of the growth striations in dislocation-free Si crystals grown by the floating-zone technique. Their video images under a uniform illumination showed spiral patterns due to the growth striations. The origin of the patterns is attributed to the electric fields which are formed locally in the growth striations and drive the photoinduced holes toward the growth direction.
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Yoshikawa et al. (1973) studied this question.
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