[Mentor's Note: Thread moved and edited by mentor.] Sorry im new and I had problems creating the thread. But I will post my question here:-D. So in reverse biased pn junction the width of the depletion layer increases. But on the N side a large positive charge from the donnor ions is building. Why it doesnt attract electrons from the acceptor ions? Why electrons doesnt flow from the P type through the N type and in to the positive terminal of Vcc?