M. A. Khan^1,, Azhar Ahmed¹, N. Ali², Tariq Iqbal¹, Ayaz Arif Khan¹, Mahboob Ullah¹, Muhammad Shafique¹

Tin antimony sulphide thin films have been synthesized as an absorber layer for solar cells. These films are deposited by vacuum thermal evaporation on glass substrate at a pressure of 10^-5 torr. The films are then annealed at different temperatures in argon atmosphere. XRD analysis reveals that both as deposited and annealed films are found to be in polycrystalline phase. The crystallinity of the films is significantly enhanced with increasing annealing temperatures. The quantum efficiency is higher in the visible and near infrared region for the annealed films whereas the quantum efficiency of as deposited film is comparatively lower. The transmittance of the annealed films is found to be decreasing with increasing temperatures. The thickness and band gap of the films are measured by ellipsometric data. The absorption coefficient of the films is significantly higher (~10⁵cm^-1), which is very important factor regarding solar conversion efficiency. Hot point probe measurements show that the films possess n-type electrical conductivity.

tin antimony sulphide, solar cell, quantum efficiency, band gap, absorption coefficient