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As thermalisation loss is the dominant loss process in the quantum dot intermediate band solar cells (QD-IBSCs), it has been investigated and calculated for a QD-IBSC, where IB is created by embedding a stack of InAs(1-x) Nx QDs with a square pyramid shape in the intrinsic layer of the AlPySb(1-y) p-i-n structure. IB, which is an optically coupled but electrically isolated miniband, divides the total band gap of AlPySb(1-y) into two sub-band gaps. To obtain the thermalisation loss of AlPySb(1-y)/InAs(1-x)Nx QD-IBSCs, the position and width of IB in the band gap of AlPySb(1-y) should be calculated. The position of IB, which is equal to the first eigen-energy of a unit cell of QD, is obtained by solving the 3D Schrödinger equation with a finite-element method and the width of IB is obtained by the absorption characteristics. Then, with the investigation of the effect of * :یکینورتکلا تسپ ،تابتاکم لوئسم : arefinia@tabrizu.ac.ir D ow nl oa de d fr om iu tjo ur na ls .iu t.a c. ir at 1 9: 03 IR S T o n S at ur da y M ar ch 1 4t h 20 20

Optimization of Thermalisation Loss in the Quantum Dot Solar Cells using a Finite Element Method