Photovoltaic Effect and Space Charge Limited Current Analysis in TlGaTe₂Crystals

TL;DRAbstract

Anisotropic space charge limited current density analysis and photovoltaic eect in TlGaTe2 single crystals has been investigated. It is shown that, above 330 K, the crystal exhibits intrinsic and extrinsic type of conductivity along (c-axis) and perpendicular (a-axis) to the crystal's axis, respectively. The current density (J) is found to be space charge limited. It is proportional to the square and three halves power of voltage (V ) along the a-and c-axis, respectively. Along the a-axis and at suciently low electric eld values, the activation energy of the current density is found to depend on the one half power of electric eld. At high electric elds, the activation energy is eld invariant. This behavior is found to be due to the PoolFrenkel eect and due to a trap set located at 0.26 eV, respectively. Along the c-axis the crystal is observed to operate under the ChildLangmuir space charge limited regime. TlGaTe2 crystals are found to exhibit photovoltaic properties. The open circuit

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