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Question
What happen to the depletion layer when a pn junction breaks? Is it remains the same or it vanishes? why?

Answer
Not sure what you mean but if you are asking about the reverse breakdown voltage it will usually overcome some spot in the junction and burn a hole through the junction causing an electrical short or low impedance breakdown.  It is irrepairable and the junction or diode is then defective.

http://www.circuitstoday.com/pn-junction-breakdown-characteristics

The above webpage tells about the breakdown characteristics in more detail.  It may help you with your question.  

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Expertise

Electronics questions about AC, DC and digital theory.

Experience

Graduate electrical engineer with over 40 years in electronic design, manufacturing, project organization and patent review. Experience in fields of industrial and consumer electronics (audio, video, acoustics, etc.)

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IEEE (Institute of Electrical and Electronics Engineers); Senior Life member AES (Audio Engineering Society), Fellow Life member

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BSEE University of North Dakota

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