diff --git a/6.11.1-band-gap-width-of-semiconductor/data.csv b/6.11.1-band-gap-width-of-semiconductor/data.csv
new file mode 100644
index 0000000..aee625e
--- /dev/null
+++ b/6.11.1-band-gap-width-of-semiconductor/data.csv
@@ -0,0 +1,30 @@
+0.0,278.5
+0.07,276.4
+0.09,273.0
+0.12,271.3
+0.15,268.0
+0.16,265.0
+0.17,262.8
+0.2,260.2
+0.23,256.6
+0.24,253.6
+0.25,251.4
+0.27,248.5
+0.28,245.9
+0.3,243.0
+0.33,240.7
+0.35,237.7
+0.36,235.5
+0.37,232.4
+0.38,227.8
+0.41,224.5
+0.42,222.0
+0.44,219.3
+0.45,217.3
+0.46,215.2
+0.48,213.6
+0.5,211.8
+0.52,208.6
+0.54,206.0
+0.55,203.5
+0.56,200.7
diff --git a/6.11.1-band-gap-width-of-semiconductor/plots.ipynb b/6.11.1-band-gap-width-of-semiconductor/plots.ipynb
new file mode 100644
index 0000000..aec54ff
--- /dev/null
+++ b/6.11.1-band-gap-width-of-semiconductor/plots.ipynb
@@ -0,0 +1,100 @@
+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "f3d63f3c-fd2c-45c8-88d6-634885aa687a",
+   "metadata": {
+    "tags": []
+   },
+   "outputs": [],
+   "source": [
+    "print(f\"{u[-1]},{r[-1]}\")\n",
+    "for _ in range(10):\n",
+    "    u.append(float(input()))\n",
+    "    r.append(float(input()))"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 20,
+   "id": "8bca9ef2-d285-4919-9690-e0275c736d5b",
+   "metadata": {
+    "tags": []
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "0.0,278.5\n",
+      "0.07,276.4\n",
+      "0.09,273.0\n",
+      "0.12,271.3\n",
+      "0.15,268.0\n",
+      "0.16,265.0\n",
+      "0.17,262.8\n",
+      "0.2,260.2\n",
+      "0.23,256.6\n",
+      "0.24,253.6\n",
+      "0.25,251.4\n",
+      "0.27,248.5\n",
+      "0.28,245.9\n",
+      "0.3,243.0\n",
+      "0.33,240.7\n",
+      "0.35,237.7\n",
+      "0.36,235.5\n",
+      "0.37,232.4\n",
+      "0.38,227.8\n",
+      "0.41,224.5\n",
+      "0.42,222.0\n",
+      "0.44,219.3\n",
+      "0.45,217.3\n",
+      "0.46,215.2\n",
+      "0.48,213.6\n",
+      "0.5,211.8\n",
+      "0.52,208.6\n",
+      "0.54,206.0\n",
+      "0.55,203.5\n",
+      "0.56,200.7\n"
+     ]
+    }
+   ],
+   "source": [
+    "with open(\"data.csv\", \"w\") as f:\n",
+    "    for i in range(len(u)):\n",
+    "        f.write(f\"{u[i]},{r[i]}\\n\")\n",
+    "        print(f\"{u[i]},{r[i]}\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "d76a5336-85dc-43d4-a453-a9868f5b214f",
+   "metadata": {},
+   "outputs": [],
+   "source": []
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 3 (ipykernel)",
+   "language": "python",
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.10.12"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 5
+}