diff --git a/data_analysis/semiconductor.py b/data_analysis/semiconductor.py
index 0df22c543303f8feb176f56ec95b84a5a6cb6f0d..d76fc967de501eca5083fcaf28a94219f3b35982 100644
--- a/data_analysis/semiconductor.py
+++ b/data_analysis/semiconductor.py
@@ -15,6 +15,8 @@ def diode_current:
 def schottky_current:
     
 def photodiode_current:
+
+def mobility_doping:
     
 def piezoresitivity_semiconductor(stress_tensor, pi11, pi12, pi44):
     stress_voigt=np.zeros((1,6))