diff --git a/src/14_doping_and_devices.md b/src/14_doping_and_devices.md
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@@ -25,6 +25,18 @@ m_h, m_e = 1, .5
     - Compute carrier density and Fermi level position of doped semiconductors
     - Describe the functioning principles of semiconducting devices
 
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 ## Adding an impurity to semiconductor
 
 * Typical semiconductors are group IV (Si, Ge, GaAs).