Question

Example 4 A solar cell with a surface area of 4.8 cm2 under irradiation of 1000 W/m2 has a reverse saturation (dark) current lo of 5.5 x 10-15 mA, the short circuit current of Isc =120 MA. At the cell temperature of 25 C° = 298 K, the P-N junction thermal voltage Vth =KT/q is 0.026 V. Determine: (i) The open circuit voltage Voc, (ii) The maximum voltage and current (Vm and Im) at the MPP (max power Point), (iii) The maximum output power Pmax, (iv) The fill factor of the cell I-V characteristics, (v) The cell efficiency

No graph provided.

Answer 1

Al the parts has been solved and solution has been solved.

( isoni I z. Ise Current Flowing in solar cell, Ise - Io (e nour -1) (l neglected ř Isc - Io is high ) v -Io e mua V (e nua NT = Uth= Thermal voltage - kt = 0.0267 Ise=short circuit = 120 mA = 0.120 A Io = dark current = 5:5*105 mA = 5:5*108 A Cument

at open circuit voltage v=Noc, Ico Voc henre, I=o= Isco Io е път Is e va » n=1 (het not given), VT=0.026 Voc Isc Voc = vt ln (Isc) » Voc=0.026 In CE x1018) = 0.026 lm (21.818x10!5) 0.080 too 898 0.978 V ( - Vue ap SO (ii) maximum voltage Vm = ? To calculate, Vm, calculate, (slope) P=VI (power) rap av 'NaNm O () [(V.:)] V=Nm Velm ㅋ I tvar It VDI av I uzum Io le te Io. < (e I= Isc - To V VT os V (V/vo) V Io val ду = VG (V] E O Vio VT V=Vm V-Nm Im til (a + V2%) = (tse-, Io le tro) [ '] = Iscas e moto gle Vm ter VT Io. e VT Vm le vi [lt van = 21.81x1015

Va Ven=0.02 bv ( given) (38.46 Vm) = 2:181 xialb (14.3 ding van). eBlou6vm) 0,885 v Ay By Trial method, lym maximum. Carment I =Im. put I= Im, v=Vm in ean Im = fsc - Io (e un ar = loma-15.5x1015 mA) -T45.5X18 0,885 0026 Im = 120mA 3.384 mA = 116.67 mA / Any output Power, (iii) soin maximum Pm = Vm Im = 0.885* 116.67 mw Pm 103. 249 mw. 103.24 x 103w (lus son: Filla factor f= Vm In lm Voc. Ise Voc Isc E = 103-24 gx103 01978 x 120 x103 •Pm Pin Pin Fill 0.879 Ang - factor, W Efficiency, y = for F. Voe Isc = Vm In Pin input Area power, Pin = Irradiation & 1000 W/m2) x 74.8 x 1 ou ima) = 0.448w Area = 4.8 cm²= r 8 x 10 m² Solar Cell

Hence, - 0.879 x 0.979x 120 x103 2 0.215 0.48 17.7 21.5 % Ang