diff --git a/synthDC/scripts/synth.tcl b/synthDC/scripts/synth.tcl
index cd4d6ff27..6a360a836 100755
--- a/synthDC/scripts/synth.tcl
+++ b/synthDC/scripts/synth.tcl
@@ -296,6 +296,12 @@ write_file -format ddc -hierarchy -o $filename
 set filename [format "%s%s%s%s" $outputDir "/mapped/" $my_design ".sdf"]
 write_sdf $filename
 
+# Write SPEF file in case need more precision power exploration for TSMC28psyn
+if {$tech != "tsmc28psyn"} {
+    set filename [format "%s%s%s%s" $outputDir "/mapped/" $my_toplevel ".spef"]
+    redirect $filename { write_parasitics }
+}
+
 # QoR
 set filename [format "%s%s"  $outputDir "/reports/qor.rep"]
 redirect $filename { report_qor }