Answered: 1. Given a theoretical solar cell with…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Question

1. Given a theoretical solar cell with open circuit (no load) output voltage of 0.55V and ideal diode
parameter Io=2x10^-11 A (for some certain sunlight conditions).
a. What is the internal diode current, equal to the solar current when there is no load?
b. Assuming the solar current stays the same as found in (a), what is the load current and
output voltage when a 100 Ohm load resistor is connected?
c. Assuming the solar current stays the same as found in (a), what is the load current and
output voltage when a 10 Ohm load resistor is connected?

Expert Solution

Step 1

Given

The ideal diode current $I_{o} = 2 \times 10^{- 11} A$

The open-circuit output voltage $V_{o c} = 0.55 V$

(a) At no-load condition, circuit act as an open circuit and Photodiode $(I_{p h})$ current will flow,

The expression for open-circuit voltage is

$\begin{array}{rcl} V_{o c} & = & \frac{k T}{q} \ln (1 + \frac{I_{p h}}{I_{o}}) \\ 0.55 & = & 0.026 \ln (1 + \frac{I_{p h}}{2 \times 10^{- 11}}) {\frac{k T}{q} = 0.026} \\ I_{p h} & = & 30.76 mA \end{array}$

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