How do I output the function call to a CSV file for review?

function Get-ServerInfo {
<#
.SYNOPSIS
Uses WMI to retrieve details from one or more servers.

.DESCRIPTION
Get-ServerInfo retrieves several pieces of information from one
or more remote servers.

.PARAMETER computername
One or more computer names to query. Accepts pipeline input.

.PARAMETER logfile
Defaults to failed.txt; will contain the names of computers
that have failed. This file is cleared each time you run
Get-ServerInfo.

.EXAMPLE
This example illustrates how to read a file containing one
computer name per line, and then format the results as a table.
Get-Content names.txt | Get-ServerInfo | Format-Table

.EXAMPLE
This example shows how to query just one computer.
Get-ServerInfo -computername SERVER-R2

.EXAMPLE
This example queries all computers in the SERVERS OU of
the AD domain Company.Com

Import-Module ActiveDirectory
Get-ADComputer -filter * `
  -searchbase 'ou=servers,dc=sleepmed,dc=md' |
  Select -expand Name | Get-ServerInfo
#>

    [CmdletBinding()]
    Param(
        [Parameter(Mandatory=$True,
                   ValueFromPipeline=$True,
                   ValueFromPipelineByPropertyName=$True)]
        [Alias('name')]
        [string[]]$computername,
        [string]$logfile = 'failed.txt'
    )
    BEGIN {
        Del $logfile -ea SilentlyContinue
    }
    PROCESS {
        foreach ($computer in $computername) {
            $continue = $true
            try {
                $os = Get-WmiObject -class Win32_OperatingSystem `
                 -computer $computer -ea Stop
            } catch {
                $computer | out-file $logfile -append
                $continue = $false
            }
            if ($continue) {
                $bios = Get-WmiObject -class Win32_BIOS `
                 -computername $computer
                $proc = Get-WmiObject -class Win32_Processor `
                 -computername $computer | Select -first 1
                $hash = @{
                    'ComputerName'=$computer;
                    'BIOSSerial'=$bios.serialnumber;
                    'OSVersion'=$os.caption;
                    'OSBuild'=$os.buildnumber;
                    'SPVersion'=$os.servicepackmajorversion;
                    'OSArch'=$os.osarchitecture;
                    'ProcArch'=$proc.addresswidth
                }
                $obj = New-Object -TypeName PSObject -Property $hash
                Write-Output $obj
            }
        }
    }
}

Import-Module ActiveDirectory
Get-ADComputer -filter * `
  -searchbase 'ou=servers,dc=company,dc=com' |
  Select -expand Name | Get-ServerInfo | Export-csv C:\Scripts\ServerDetails.csv