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Abstract
The stoichiometry influence of polycrystalline lead selenide material on crystalline structure and photoelectric properties was demonstrated. The responsivity of 3.97A/W was achieved biased at 4V with the optimal iodine molecular density of 9.1×1011mm−3 and oxygen pressure of ~0.15MPa in the sensitization process. The photoelectric performance can be further enhanced with iodine at low iodine molecular density of <1.5×1012mm−3. It is revealed that a serious deviation of Pb/Se atomic ratio from 1:1 is responsible for the significant decline of responsivity due to over-iodination in the sensitization process. It is helpful to understand the roles of iodine and oxygen in the sensitization of lead salt materials.
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