Create Modern Site Collection in SharePoint Online using PowerShell

Requirement: Create modern site collection SharePoint online PowerShell

SharePoint Online: Create Modern Team site using PowerShell
SharePoint Online modern sites provides a whole new user experience by its intuitive design, responsive UI optimized for mobile devices and faster page loading. By default, when you create a site in SharePoint Online admin center, it creates modern team with an associated Office 365 group. To create a modern SharePoint Online Site collection, follow these steps:

• Login to New SharePoint Admin Center as a tenant admin or SharePoint Online Administrator. 
• Click on Sites >> Active Sites from left navigation >> Click on "Create"
• Click on "Team site" to create a modern team site in SharePoint Online.
  
• Provide the site Name, URL, Group owner options and click on "Finish" to create a modern site collection in SharePoint Online.
  

Wait for a moment and your site collection should appear in the site collections list. Now, let's see how to create a modern team site without a group in SharePoint Online using PowerShell.

SharePoint Online: Create Modern Team Site Collection using PowerShell:
You can create a modern site collection in SharePoint Online by specifying the site template as "STS#3".

#Connect to SharePoint Online
Connect-SPOService -url "https://crescent-admin.sharepoint.com" -Credential (Get-credential)
  
#Create a modern team site
New-SPOSite -Url "https://crescent.sharepoint.com/sites/Purchase" -Owner "Salaudeen@Crescent.com" -StorageQuota 2048 -Title "Purchase Team Site" -Template "STS#3"

Create Modern Site Collection in SharePoint Online using PowerShell
Create modern team site using PowerShell in SharePoint Online

#PowerShell to create modern site collection
Function Create-SPOSite
{
  param
    (
        [string]$Title  = $(throw "Please Provide the Site Title!"),
        [string]$URL = $(throw "Please Provide the Site URL!"),
        [string]$Owner = $(throw "Please Provide the Site Owner!"),
        [int]$StorageQuota = $(throw "Please Provide the Site Storage Quota!")
    )
 
#Connection parameters 
$AdminURL = "https://crescent-admin.sharepoint.com"
$AdminName = "SpAdmin@crescent.com"
  
Try{
    #Connect to Office 365
    Connect-SPOService -Url $AdminURL -Credential (Get-Credential)
  
    #Check if the site collection exists already
    $SiteExists = Get-SPOSite | Where {$_.URL -eq $URL}
    
    #Check if site exists in the recycle bin
    $SiteExistsInRecycleBin = Get-SPODeletedSite | where {$_.url -eq $URL}
 
    If($SiteExists -ne $null)
    {
        write-host "Site $($url) exists already!" -foregroundcolor Yellow
    }
    elseIf($SiteExistsInRecycleBin -ne $null)
    {
        write-host "Site $($url) exists in the recycle bin!" -foregroundcolor Yellow
    }
    else
    {
        #sharepoint online create modern site collection powershell
        New-SPOSite -Url $URL -title $Title -Owner $Owner -StorageQuota $StorageQuota -NoWait -ResourceQuota $ResourceQuota -Template $Template
        write-host "Site Collection $($url) Created Successfully!" -foregroundcolor Green
    }
}
catch {
    write-host "Error: $($_.Exception.Message)" -foregroundcolor Red
    }
}
 
#Parameters to create new site collection
$SiteTitle = "Purchase"
$SiteURL= "https://crescent.sharepoint.com/sites/purchase"
$SiteOwner = "spsadmin@crescent.com"
$StorageQuota = 2048
$SiteTemplate = "STS#3"
 
#Call The function to create site collection
Create-SPOSite -Title $SiteTitle -URL $SiteURL -Owner $SiteOwner -StorageQuota $StorageQuota -Template $SiteTemplate

PnP PowerShell to Create Modern Site
Here is how to create a modern site collection using PnP PowerShell in SharePoint Online

New-PnPSite -Type TeamSite -Title Test Modern TeamSite -Alias TestModernTeamSite -IsPublic

Let's wrap it inside a function and add some error handling to it:

#Define Variables
$AdminCenterURL = "https://crescent-Admin.sharepoint.com"
$SiteURL = "https://crescent.sharepoint.com/sites/procurement2"
$SiteTitle = "crescent Procurement Portal"
$SiteOwner = "Salaudeen@crescent.com"
$Template = "STS#3" #Modern Team Site
$Timezone = 24 #GMT+4
 
#Get Credentials to connect
$Cred = Get-Credential
 
Try
{
    #Connect to Tenant Admin
    Connect-PnPOnline -URL $AdminCenterURL -Credential $Cred
     
    #Check if site exists already
    $Site = Get-PnPTenantSite | Where {$_.Url -eq $SiteURL}
 
    If ($Site -eq $null)
    {
        #sharepoint online pnp powershell create site collection
        New-PnPTenantSite -Url $SiteURL -Owner $SiteOwner -Title $SiteTitle -Template $Template -TimeZone $TimeZone -RemoveDeletedSite
        write-host "Site Collection $($SiteURL) Created Successfully!" -foregroundcolor Green
    }
    else
    {
        write-host "Site $($SiteURL) exists already!" -foregroundcolor Yellow
    }
}
Catch {
    write-host "Error: $($_.Exception.Message)" -foregroundcolor Red
} 

How to create a modern site without group? SharePoint Online: Create Modern Team Site without Group