• Calculate positive 300 K pn-junction built-in potential from acceptor, donor, and intrinsic carrier concentrations.
• Compare fabrication or device scenarios while holding coefficients and unit conventions constant.
• Check a hand calculation before moving to a higher-fidelity process, circuit, or TCAD model.

A positive pn-junction barrier requires NA·ND greater than ni²; lower products are rejected rather than reported as a negative built-in potential.

• The nondegenerate equilibrium expression assumes complete ionization, uniform neutral regions, and a consistent 300 K intrinsic concentration.
• Use parameters measured for the same material, geometry, temperature, and operating regime whenever the result informs engineering work.

• Depletion Width Abrupt Junction

  Use Depletion Width Abrupt Junction to compute the total depletion width of an abrupt pn junction from built-in and applied reverse bias. Choose this tool when you need to calculate positive 300 K pn-junction built-in potential from acceptor, donor, and intrinsic carrier concentrations.

• Charge Neutrality Carrier Solver

  Use Charge Neutrality Carrier Solver to solve equilibrium electron and hole concentrations for compensated material from donor, acceptor, and intrinsic concentrations. Choose this tool when you need to calculate positive 300 K pn-junction built-in potential from acceptor, donor, and intrinsic carrier concentrations.