{"id":318548,"date":"2023-11-20T14:30:02","date_gmt":"2023-11-20T14:30:02","guid":{"rendered":"\/forum\/forums\/topic\/divergence-issue-for-charge-transient-simulation\/"},"modified":"2023-11-20T14:30:02","modified_gmt":"2023-11-20T14:30:02","slug":"divergence-issue-for-charge-transient-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/divergence-issue-for-charge-transient-simulation\/","title":{"rendered":"Divergence issue for CHARGE transient simulation"},"content":{"rendered":"<p>Hello,<\/p>\n<p>&nbsp;<\/p>\n<p>Currently I&#8217;m running transient simulation in Lumerical CHARGE, to see semiconductor device&#8217;s electron &amp; hole behavior as a function of time.&nbsp;<\/p>\n<p>Structure is as follows: Metal\/Semiconductor\/p-Si\/Metal.<\/p>\n<p>Positive bias is applied in the form of pulse to one metal contact for 3 us, and ground is applied in the other metal contact.&nbsp;<\/p>\n<p>I reffered to <a href=\"https:\/\/optics.ansys.com\/hc\/en-us\/articles\/8355464963987\">this article<\/a>, seems that it&#8217;s not quite adquate to my situation but anyway, it dosen&#8217;t work. Modulated &#8216;init. step size&#8217; to minimum, turned on &#8216;gradient mixing&#8217;.<\/p>\n<p>&nbsp;<\/p>\n<p>Problems are as below:<\/p>\n<ul>\n<li>Diverge at t=0, if I set &#8216;convergence method&#8217; as &#8216;limit update&#8217;<\/li>\n<li>Diverge at t=10ns, if I set convergence method as &#8216;linear search cubic&#8217; or &#8216;linear search bank rose&#8217;.<\/li>\n<\/ul>\n<p>Meshing is fine.<\/p>\n<p>Here&#8217;s the geometry and settings:<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/20-11-2023-1700490515-str.png\" alt=\"\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/20-11-2023-1700490293-q.png\" alt=\"\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/20-11-2023-1700490540-q2.png\" alt=\"\"><\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/11\/20-11-2023-1700490317-q1.png\" alt=\"\"><\/p>\n<p>&nbsp;<\/p>\n<p>Regards,<\/p>\n<p>Sungmin<\/p>\n","protected":false},"template":"","class_list":["post-318548","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["27378","33648"],"_bbp_author_ip":["23.52.43.81"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["273"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["318548"],"_bbp_forum_id":["27833"],"_bbp_engagement":["27378","33648"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["319283"],"_bbp_last_active_id":["319283"],"_bbp_last_active_time":["2023-11-24 00:16:10"]},"test":"sungmin-yoonkaist-ac-kr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/318548","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/318548\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=318548"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}