Powershell script equivalent of database -> Generate scripts - sql-server

Question

I wrote a PowerShell script which stores schema, and data info in .sql file.
But in that file I am missing the initiate part of create database. The file starts with queries of create table.
PowerShell script:
$Filepath= 'C:\Temp' # local directory to save build-scripts to
$DataSource= 'ServerName' #'SERVERNAME' # server name and instance
$Database= 'DBName'
$DateTime = Get-Date -Format s
$dateStamp = $(get-date).ToString("yyyyMMdd");
$ErrorActionPreference = "stop"
$ms='Microsoft.SqlServer'
$v = [System.Reflection.Assembly]::LoadWithPartialName( "$ms.SMO")
if ((($v.FullName.Split(','))[1].Split('='))[1].Split('.')[0] -ne '9') {
[System.Reflection.Assembly]::LoadWithPartialName("$ms.SMOExtended") | out-null
}
$My="$ms.Management.Smo" #
$s = new-object ("$My.Server") $DataSource
if ($s.Version -eq $null ){Throw "Can't find the instance $Datasource"}
$db= $s.Databases[$Database]
if ($db.name -ne $Database){Throw "Can't find the database '$Database' in $Datasource"};
$transfer = new-object ("$My.Transfer") $db
$transfer.Options.ScriptBatchTerminator = $true
$transfer.Options.ToFileOnly = $true
$transfer.Options.ScriptData = $true
$transfer.Options.IncludeHeaders = $true
$transfer.Options.ExtendedProperties = $true
$transfer.Options.IncludeDatabaseContext = $true
$transfer.Options.DriForeignKeys = $true
$transfer.Options.DriIndexes = $true
$transfer.Options.DriPrimaryKey = $true
$transfer.Options.DriUniqueKeys = $true
$transfer.CreateTargetDatabase = $true
$transfer.Options.Filename = "$($FilePath)\$($Database)_$($dateStamp)_Build.sql";
$transfer.EnumScriptTransfer()
Any help on how this can be achieved?
Basically I am missing create database block in my .sql file.